If Doug's capacitor suggestion
It was a capacitor. Looks like a small soup can.
is a consideration of yours ...
The first photo shows the AC cover removed - remove four screws on top - lift off cover. Access to the capacitors is by removing panel on side - 2 sheet metal screws.
2nd photo: The larger of the capacitors is the compressor capacitor. The smaller one is the fan capacitor, and the (3rd photo) black one is a hard start capacitor I added. (You might already have that one.)
This is an Airxcel 48000 Series AC ... don't know if yours is like this or not, but hope it helps.
IMO Airxcel has excellent technical assistance - email or phone.