If Gorgar is failing often enough that you are pretty sure you can get it to fail during game play, then I'd just swap the power supply board from Time Warp into Gorgar. That'll tell you if the problem is inter board connector or psu related.
The power supplies are practically identical. Gorgar will / may / should have the bigger filter cap - because it is effectively a three flipper machine, but to test normal play it will be ok to stick the TW one in as you would never in normal play press both flippers and have the snake magnet energised simultaneously.
