Check out this thread regarding the dimples on your Tron Pro, I've got them as well and I think everyone else does as well (totally normal):

http://pinside.com/pinball/forum/topic/stern-tron-pro-playfield-gettin-dimples

At least I'm assuming what you're looking at is dimples, if it's indeed dents well then that sounds like trouble.

Grats on the Tron. Dimples are totally normal. I had some cab decal damage too and Chas took care of me with a new decal also. I'm just gonna hang onto it and perhaps change it later. My disc has not been loud to my ears during normal play with glass on. You can hear it, but not a bother to me.

The dimples are normal. My spinning disc made a lot of noise at first too. I did not make any alterations to it, although some owners did put a drop of oil somewhere on the shaft near a bearing. It seems to be better now that it has had some use (unless I just got used to the noise and don't notice it anymore).
I'm surprised to hear that so many buyers found damage to their cabinet sides. Enjoy...its a great game.

Sounds like your built-in bubble is off. Do not trust it. Try setting the playfield with a true level placed directly on the playfield. I'm guessing you will find that the pitch is currently much higher than 6.5, which would cause the issue you are experiencing.

Holy air balls! The Pro I play on location (likely hundreds of games since its release), I have NEVER had any air balls hit the cycles. And rarely get any air balls in general.

I've had a good number of airballs hit the right spotlight, a number of them land on top of the recognizer plastic, but none anywhere near the light cycles.

I just had the LED on top of pop bumper get chopped off by an air ball..

That's not normal. Check for level and look at make sure zuse targets are in correct alignment and foamed properly.

Why does this come up like every three days when it's been explained to death and back? You should see mine. ~500 plays and looks like the surface of the moon. Doesn't affect ball travel at all.

That's weird my playfield on my new tron hasn't really dimpled at all

I've had dimpling on all of my games in the past (four) to some extent or another. My HUO BDK that I just picked up has about 500 games and the playfield is as smooth as glass. Are the dimples coming or am I in the clear as far as dimples go? Thanks.

My BBH never dimples. Solid as a rock.

Your game is broken!!!!

Dimples are not an issue. Probably every game you own has some. You just don't notice them because the PFs are not new.

Sorry. A 20 year old game has been beat in to normal wear. A new game will dimple until you can't tell anymore. Just do what they did when they unboxed your old games. Play the heck out of it : )

John Greatwitch talked at Expo about how plywood sold today is much softer than plywood sold 30 yrs ago. I wouldn't worry about the dimpling, as others have said eventually it will all blend in the end.

This sounds bad, compared to the original post, which sounds normal. I'd be interested in seeing a pic, but looks like it never came through?

I have damage on RHS of cab also and Stern also sent me a new decal its not to bad but NIB it shouldn't be there. PF Dimples everywhere.

John Greatwich deals with taking old, already compressed playfields and reprinting them. By the time a playfield is worn enough to need a complete reprinting, it is going to be VERY compressed.

The APA stated that today's plywood, species for species, grade for grade, is harder and stronger than plywood 40 years ago in their 2009 study.

If anyone thought that dimpling was an actual problem, they would have switched to a harder playfield plywood decades ago. You can get lumber core plywood with Hard Maple cores all the way through.

Dimpling is normal - insert wear, that probably shouldnt happen on a three day old game

are you sure it's wear and not just dirt? Try rubbing it with some novus. Tron gets very dirty (another topic that has been talked to death).

I think he is referring to the 2nd picture above where the black line is rubbed off the border

Yep. Dimpling is normal. It looks like the clear chipped and is worn on the top of the lightcycle insert. That is not normal for a NIB ame with a few plays IMHO.

In your opinion, what is the reason for the dimpling if the plywood is not the culprit? John states that he believes the plywood IS the reason. I don't know enough about the artwork/playfield creation process, but I am curious if is the art or the wood being compressed.

The "art" is just outdoor sign paint, screened onto a wood playfield, sometimes covered with a clear coat .

Take a heavy steel ball and drop it onto almost any wood, even Ebony, and it will leave a dimple.

Hell, drop a heavy steel ball on the roof of your car and it will leave a dimple.

This is just completely normal physics; the steel ball is harder than wood.

Even if you screen art onto the wood, a thin layer of ink is not going to make the wood harder than steel.

Even if you spray a layer of clear coat, the clear coat is not going to make the wood harder than steel.

Take a look at this proof:

http://pinside.com/pinball/forum/topic/playfield-dimple-reality-check

Vid, thanks for the heads up.

I think Robin should make your other thread a sticky to keep this subject from popping up all the time.

Seriously. Why is this such a difficult concept to grasp?
The sky is falling! Dimples on my playfield! My flipper rubbers are turning black! The sun is setting!

I think that spot looks like a screening error. I'm surprised it wasn't noticed before the game was played a few days though.