[Chester Stone]

Richard, the commons I am referring to are the white wires going to the compressor connections. The white to the #1 compressor is connected to a bundle of whites including the incoming power. While there is a green ground wire at the thermostat that connects to blue, I have found no green at the board.

Looks like Russ is correct even though I do not understand why.

Later this afternoon I ran the rear compressor in low for a longer period and while the fan worded, I doubt it was cooling. I will run again in the morning and if it is not cooling, it's time to swap out the boards between #1 and #2.