Update - FIXED!
Fred and Lt Dan - Thanks for your input, totally agree.
Once I got the panel off, I could confirm that Compressor #2 was not running. When the circuit board would call for #2 to start, it seemed like the whole system slowed down but would recover without Compressor #2 starting. I first checked the start capacitor and it was fine. Same with the run capacitor.
There is also a red LED on the circuit board that indicates when the board is calling for Compressor #2 to run. It illuminates a few minutes after the AC turns on if the temp is set low enough. Red LED was on.
I studied the schematic on the electrical access panel and did a little more research. Compressor #2 runs through the Intellitec system which shuts down the 12 volts to the power relay if its managing only 30 amps of coach input power.
So I checked the relays for #1 and #2 compressors. #1 was getting high voltage fine but no power was being passed through the relay to #2 compressor.
Next I checked the 12 volt signal going to the relay via the Intellitec and it was dead. Using my PowerProbe (if you don't have one of these tools, BUY ONE!), I applied 12 volts to the relay and BINGO, Compressor 2 started!
Since we'll be plugged into 50 amps or running the genset, I pulled out the wire (white with black stripe) going to the Intellitec and plugged the orange wire from the relay directly to the circuit board. I'll mess with the Intellitec when I have time.
Ran the AC for a few hours and the air was much colder coming out of the roof vents.
We'll be doing a NJ to CA to NM to TX to MS to FL Keys trip in two weeks. I was very concerned that we'd be sweltering in the coach while driving through the desert. For now, we're cool!
Tom and Katharine
'07 Winnebago Tour 40TD, 400hp Cummins
'17 Winnebago View 24V, '02 R-Vision B+
RVing for 20 years & 200,000+ miles