I had a mobile RV repair technician come out and performed the service bulletin on both of my air conditioning units. They only have you sealing two of the original mounting holes--I guess the others aren't in a location of concern. Then you drill lots of holes in the plastic base to drain better. We also found quite a few holes that had debris from installation (wood shavings, plastic, etc.) that were clogging up existing holes and opened them up. It seems as though sloppy installation contributed to all this along with the draining in the right location. I've had both air conditioning units running for over 6 hours now with no leaks. Since the technician wasn't a "Heartland" warranty approved tech (he is Dometic) I paid him--hope Heartland comes through with my reimbursement without problems. For those with flow questions, the service bulletin does not address this.
There is damage to the ceiling in the form of water stains. Anyone have any idea how hard this is to repair? It seems to be some sort of "paper" applied to the ceiling material. While this is a warranty issue, I have some concerns about how quickly my dealer can do this (and how competently).
Just a quick update. It's been five days since the service bulletin was performed. Our weather has not been too hot, but the air conditioning units have been running a lot with no more leaking. Looks like the fix worked.