When all else fails, DIY
Doing RV repair/maintenance is actually easier than you think. Read the instructions, but I would also just "learn" how the water system works, and where everything is.
2 Water IN: City hookup, inlet to FW tank.
3 Water OUT: Low water drain valves (hot/cold), & FW tank low drain valve.
Once I learned how to do my own RV repairs and maintenance, It actually made owning it much better. I don't feel like I "need" the dealership lifeline. Good luck!