Not sure about your model, Chris, but ours is underneath the coach in front of the entry steps. The automatic fill feature from the compressor only works if we initially use automatic leveling; it won't work if manually leveled.
As per several threads in this Forum, those little compressors commonly fail, either due to corroded or damaged connectors and wires, or motor failure from exposure to road contamination. Check its air tubing also, but if you never hear it run while camped, it is likely electrical or motor failure.
Many owners replace the factory unit with a Viair model 380, which is much more resilient in such a hazardous location. It may require some circuit modification though - heavier wires, etc.
Joel
