We located DJM Enterprises via internet as authorized repair facility for both Atwood & Thetford (our stove and macerator were the problems we were having). After taking the coach in on the scheduled day, parts for the stove were ordered and work begun on the macerator. The person working on the macerator had a total of a couple months experience working on RV's. and none on macerator. The directions from Thetford was to check for debris accumulated on the chopper blades. Discovering debris here, the unit was cleaned and reassembled and we were charged for 2 hrs work @$105/hr. Arriving back at the park, I checked the flow-through of the pump, and nothing had changed except for a horrible leak around the seal to the motor. Taking the coach back the repair facility, I asked why the flow wasn't checked since that was the problem I was having fixed. No comment on the testing of the work performed and "I didn't touch that part" the response about the newly formed leak. In checking flow (and leak) their decision was a venting problem with the coach (again no testing to prove theory). Since no plumber was available (brother out of town) I was told to come back the next day. I took the coach back to the RV park, dismantled the pump and found the impeller blades literally falling apart. Took this part back to DJM to order new parts. When parts arrived in a couple of days, found the same unqualified installer trying to reassemble new pump into old housing container. I got so frustrated watching the process, that I assembled and/or provided instructions (Teflon tape to be wrapped clockwise so proper seal is achieved, don't forget the band clamp this time, etc.) For this we were charged an additional 1 hour of work. In short, work on the stove, good, actually better than the work Newmar performed 3 weeks earlier. Work on the macerator, total incompetence by unqualified people charging obscene rates based on the work performed.