I have a 2014 Keystone Alpine 3600 RS. Recently there has been an intermittent leak just below my rear AC Unit at the center of the ceiling by the first seam. No water at the return vents. No water at...
Did you check the pan. Be sure it is clean. I recently had a leak problem, but it happened in heavy rain when the A/C was running. Tightened the motor and leak stopped. There is a gasket under the motor shaft. But yours sounds like the pan. If your model has a tube that comes out of the pan, check it to be sure it is not blocked.