If you have the system on automatic level and hear the compressor at least occasionally, but still wake up to the lean, then you must have a substantial air leak. I would think you'd hear the compressor (curbside front near the steps) run unusually often trying to catch up, perhaps constantly since it obviously can't keep up.
If you can get to a facility with a service pit, that's often a good way to safely get access under the coach to see if the leak can be located.
These leaks are often fickle. We had a similar one last fall, and between Henderson's and BCS tweaking many suspicious spots, it wasn't resolved. But it hasn't leaked an iota during this year's travels.
Joel
