So my buddy got one of the first Pro models in Canada and it had some of the common problems. Stern sent a couple of replacement parts, I thought I would share photos. First of all the replacement ramp post is definitely an improved design, using a roll pin instead of dimples like the original. I don't have a photo of the original, it will remain installed until it comes apart again. I had to hammer it back together once but it's been ok since.
new ramp post
They also sent new gates for the exit under the left of the demogorgon, but as near as I can tell, they are identical. I chose to simply remove the gate and we played for a couple of hours without issues. The original gate fell off one side after only a few plays, however we didn't realize what was going on, it's hard to see under there. A ball would frequently get stuck and really make the game not fun.
new gates side by side
new gates on top of each other
This game has another problem which I haven't seen mentioned, but maybe I missed it. The right orbit shot doesn't register reliably when the shot is made. In switch test mode, it works perfect. But during play it seems that some of the time, the ball can roll past the switch on the left side and not press it down. I'm not sure what to do about this. Maybe stick something on the left lane guide to make the passage just a bit narrower?
right orbit switch
And finally the outlane posts. They came installed in the wide open setting, and we would like to move them to the middle. I had no trouble getting the nut off the bottom of a post. But the post did not want to budge out of the playfield. I was afraid to hammer on it. Is there a trick to remove the posts?