Best to start getting familiar with this stuff yourself. It's a simple system that does not require a "mechanic". You'd be better off talking to a plumber or an electrician (don't get scared now -- it's only 12v). When you hit the fill switch on that "sprinkler" system it turns on the pump (same fill pump for all 3 bags). The particular switch (R,L,C) will also open the valve for the line to that bag. Lots of times all you have to do is remove the gray sprinkler valve, open it up and clean the crap out of it. Make sure the black lever is set to closed so it will not fill on its own. You can get a new one at Home Depot for about $15. No need to pay a mechanic-- this is really simple stuff. Good luck. If you have questions, take a pic of what your are looking at, post it and ask your question. We are all here to help.