So I purchased a diagnostic software package. It allows me to run diagnostics on all of my LR3 components. I'm getting these faults:

Air Suspension - Pressure Increases Too Slow When Filling Reservoir

Transfer Box Module - Lost Communications With Ride Level Control Module
I was able to clear this.

Instrumentation - Lost Communications With Ride Level Control Module
Lost Communications With Park Assist Module, and Lost Communications With Tire Pressure Control Module.
I was able to clear these faults, as well.

My main concern is the Pressure Increases Too Slow When Filling Reservoir. Is this a bad compressor?

 

More likely a leak in the line, fittings/couplings, or the bag

 

Its probably a front strut leaking (Ive never replaced a rear) and it seems to be the drivers side most often for some reason. If your compressor still has a plastic shield around it it is the old design and needs to be updated anyway. Its right in front of the driver side rear wheel on the outside of the frame.