Quoted from DocRotCod:
You can undo the three screws, and lift the playfield and rest it on the backboard without disconnecting the wires.
Well, I just discovered that you certainly don't need to disconnect the wires to the TV Mode sign - they're completely independent of the playfield. Of course I found this out since I just had to take it back apart. Wasn't careful about the wires when I put it back earlier and a some hung out over the hidden garage ramp. Went to play and the the first ball into the garage never came out.
Not hard to fix, but nuts. Was a bit more careful this time. Seated the playfield, then wrestled a bit with the wires from beneath the main playfield. Could tell when I had it right when I knew what to look out for. Tightened it down and things are (finally) back to normal.
Table is lucky that I'm a big ol' nerd and find this all interesting.
Edit - I have angered the Gods or something. Switch almost immediately acting up. Switch test registering roughly 50% of the time I put a ball through - even when I hear the little click sound that the switch makes when it's getting pressed down. Pulled it all apart and adjusted it again a bit - it's now really sensitive. Test mode works *most* of the time, and I was able to play a couple games where the switch worked all but once or twice, but it controls the TV mode starts and the timer - really need it at 100%.
Assuming the next step is just replacing it?
For what it's worth - here's a picture of the switch. In comparing it to a new one, I do immediately see that the diode has been bent over. Could that cause this intermittent issue? (I honestly have no damn idea what a diode does.)
PS - Thanks again to everyone that has offered advice and help here. Sorry to dominate the thread so much. First time owner, and learning the ropes.