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Test mode shows EQPM error. I recently had the board serviced, and it worked fine for a while. The fellow who serviced it said it's unlikely all the components needed for those errors became faulty at the same time (given how it was functional a day before), so it could be whatever chip communicates between the two boards may be faulty. But that's the extent of my knowledge and understanding of what the problem could be.
Are you sure you're measuring at the right spot? There is the 10.6VDC unregulated on the ARII you could be measuring by mistake instead.Okay, so I tested voltage on the PCB and ARII. The AR is giving me 9.6v at it's lowest possible trimmer pot setting, and the boards are getting 8.6v...not sure how to get that down to 5v?

It's a DC voltage, you should be measuring with the DC setting on your meter.Just measured it again across the C1...still showing as 9.6v :/ I'm measuring it with AC not DC, is that the right way? I also measured at the +Sense and get the same voltage reading.
Where are you measuring the 5V?
See post #4 above.
Measuring across the C1 capacitor; also measured at the +Sense! Both give me the same reading. Same thing at the +5v on the edge of the pcb near where the harness connects.