Mike, I suspected my roof A/C drains were not working so I found the drain lines (big 1/2 id black rubber hose) front ac drains just behind front drivers slide, rear a/c drains right on top of my tailpipe extension (curb side rear). I took a smaller dia hose and blew into the front ac drain and it took a bit of pressure but hose was clear. I found that they will drain when the coach is level, especially side to side. I think the drip pans drop into the base frame of the ac unit, so you would have to pull off the cover. The pans connect to each other with clear pvc tubing. You can do a search for drip pan kit (I think) and find the parts. But I suspect any issue has more to do with being slightly out of level.