I recently heard a new noise coming from my basement A/C. When the unit shuts down, it sounds as if a motor is still running, which last for approx 10 minutes, then shuts down. As a result, I have become more attune to what I don't hear and that is the second compressor kicking in.
It sounds as if it is working on reduced power yet Iam connected to 50 AMPS and the selector switch is on 50 AMPS.
Any thoughts on what may be the problem and am I doing more harm to the unit using it until I can get the problem corrected?
Thank you for any assistance.

I can't imagine what the 10 minute run-on motor sound would be... Is it perhaps a blower motor in the unit?

You could always flip the breaker for the second compressor off and see what happens. I ran mine with the second breaker off for a month before I could get it to service with I could hear it trying to kick in but failing.

I don't know how an Alpha is set up, but if similar to my Winnebago you could also plug into 30a or run it on generator power and watch the inside amp meter (assuming you have one). If it works like mine, you should see the first compressor kick on and then see the amp load. Mine has an apx 2 min delay before #2 kicks on, at which point you can see the amp load increase from apx 17 to apx 24.

Or call the mfg. If it is RVP, they are normally pretty good at walking you through trouble-shooting the unit.