As I'm sure you've surmised by the title, my TAF has started resetting. It's somewhat inconsistent, but it will eventually happen. Let me start by catching you up on what I've done and checked so far, per PinWiki:
Reseated all ribbon cables to/from Power and CPU boards
Reseated all power cables with wires larger than 18ga
Checked/cleaned PDB grounded mounts
Checked continuity of all fuses
Outlet power: 119.7V (both ACs running, same circuit as a powered on/playing TZ)
TP2 voltage: 4.97V
Voltage at pin 32 on ROM: 4.94V
When the game is in attract mode, LED3 is almost consistently on, only dimming from time to time. When the game is being played, it's typically off, only lighting up when solenoid fire. The game doesn't always reset, though. Pressing both flipper buttons makes LED3 light up fairly well, but doesn't automatically make the game reset. Something else has to be going at the same time, like a kicker or the magnets.
The only thing kinda hinkey with the game right now is the power lead to the Thing scoop kicker solenoid is off and needs to be resoldered. I haven't fixed it yet because it's easy, and I wanted to tackle the hard stuff first. Could they be related? I'll admit I didn't think about power supply wiring signal integrity and its side effects. Perhaps I'll do that while I wait for responses and ideas of how to proceed.
All of this is just to make sure I'm following procedure correctly and am checking everything as I should before I test BR2 and C5, and/or start pulling the power board. I've thought about swapping it with my TZ's board to try and see if what's wrong is isolated to the board itself, but only after exhausting all other possible causes and testing everything I can.
Any help with what else to check or any tricks you can think of would be greatly appreciated!