Here are pix of the 1 I know worked fine...
What I mean by "seal" is the white ring that clamps together(Closest to the front of the cab). It's also just a tiny amount of smoke. The only reason I finally saw it was because I left it on for about 10-15 mins and opened the back panel up. It had built up enough to be visible. The pcb on the rear looks to be OK,same as all the rest. Could it just have been dirt from sitting and/or being that old? Seems to be original and from ~88. No signs of ever being rebuilt. The screen still seems to come up when turned on and gives the white to the center when turned off.
I'm thinking game board. Your thoughts?
Pessimist: Oh, this can't get any worse!
Optimist: Yes, it can!