I had mobile RV repair do it.
"I" was the one inside the MH turning the key as he tested each solenoid so I don't know where they all are except the one that needed replacement on the fender wall!! :B
Gotta tell you I thought for sure it was a dead short or something not knowing about all the solenoids. He has seen SO many of these RV's he knew right away what the problem was when I told him it wouldn't start sometimes. There is no clicking just dead won't start.
I was stuck of all places at the dump station the last time it wouldn't start.....talk about having people behind me ready to go postal!