Super C Aux Air Compressor for Seats

[KenK]

I have a 2026 Newmar SuperStar 4159. The aux air compressor is located on the pass side first storage compartment. This compressor is use for operating the seats when the chassis air is not available.
Issue: The compressor will not turn off. Must use the switch in the storage compartment to shut off the compressor. If run continuously, can overheat and fail, or worse.

I tried letting the compressor run for 5 minutes. Thinking it would charge the small tank and shut off.
I tried starting the engine and letting the chassis air charge to 120psi. The Aux compressor kept running.
I can hear no leaks. Hard to trace air lines to the seats.
Chassis air does not show any signs of leaks with engine off.
Seats work fine using chassis air.
I have not taken apart the box the aux compressor is mounted in. There is no access door to the compressor.

Does anyone have any info (electrical drawings, installation drawings, manufacture name, etc) for the compressor and how it is integrated with the seats.
How does the aux comp and the chassis comp both feed air to the seats? These systems have to be cross connected somewhere.

Pressure sensor could be bad? Air line may be disconnected?

Thanks in advance for your input.