Seeing intermittent Door Open M during play on a 2009 Alpha Pro V32; I swapped the I/O card, reseated the backplane, cleaned the J13 connector, and polished the door latch ground, but it still trips about 10–15 minutes into a session… DMM shows 5.05V at the PSU but only 4.86V at the MPU when reels spin — anyone solve this with a new harness or is the hinge-side door optic usually the culprit?