Mike, be sure to check the air conditioner seals as this may be the point of water intrusion. You can drop the ceiling assmy; unless you have a Newmar that does not completely penetrate the roof and ceiling. Have someone run water around the units while you inspect from inside. A simple tightening may or may not resolve the problem. If not the unit will have to be pulled off and a new seal installed. When tightening down the unit you only want to compress the sell about 1/2 its thickness or about 65 inch lbs of torque. Water intrusion is not a clear cut, easy to find thing. If you continue to have an issue, a good repair center with a Sealtech that can pressurize the inside of the coach and water can be run over the outside. Any leak will cause bubbles to emit at point of leaking. Let us know what you find.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7