Hey thanks for the quick reply! I looked all over that diagram and completely missed that haha.
All voltages seemed to be reading correctly throughout the whole board per the voltage chart. I did pull the optocouplers last night and will need to rebuild them to verify polarity as I had to cut the led legs short. I’m assuming that green LEDs were used for intensity rather than red? Pretty sure I have some green 3mm somewhere, but I know I have some red for sure. Once I rebuild and place the optocouplers, I will do step D-3 (I have no idea why I didn’t try that before I pulled the optocouplers haha). Will report back asap.