Send hubby back up on the roof.
He has to unscrew the cover off the RTAC. At the rear of the RTAC he will find a drip pan. It is usually white in color and has a couple holes in the bottom. Trouble is, the holes are usually pretty small and can get plugged up by the least little bit. I personally recommend that you drill those holes larger, but in the short term, unclog the holes, check for any adjacent debris, and then reinstall. This should solve your water in the coach problem until the next time the holes plug up again.
