okay, made some headway for those who might be experiencing similar issues. start testing voltages from the MCR suitcase into the power supply with the output connectors unconnected, got a good stable 6v (don't forget this is unloaded voltage, it will drop when the load is applied and when all is working can be adjusted) next start tracing voltage from here. plugged the outputs back into the power supply and disconnected the ssio/video pcbs, it dropped back to 3v (always measuring voltage at the 5v cap on the power supply next to the output connectors) while thinking that there must be a short somewhere in the output connectors or the wiring to the main game pcbs i noticed that some of the wiring from the output connectors was going up to the front of the cab (coin door and control panel) meticulously unplugging, then measuring the voltage between each connector throughout the front end of the cab, i traced back to a connector going into the spinner wheel under the control panel, which when unplugged got me my 6v back at the power supply. i then plugged the audio amp back in (leaving the spinner wheel unconnected) still got 6v, so far so good, but then when i plugged the main game pcbs back in (just the power and video connector, as illustrated by todd from TNT amusements video on youtube) she dropped to the 3v at the power supply. sooo, it looks like i have a malfunction/ short on the game board AND at the spinner wheel?! I've already reseated many of the chips on the board, still get a flashing yellow LED at top of ssio board which i heard indicates a bad ROM, i'll go ahead and reseat the rest and replace the caps on the ssio/video pcbs. When this TRON started going bad it was losing sounds and would make popping noises, then it started just to reset on its own, so i'm thinking caps