Sad..
Sorry to hear this.
But, I can't blame the shops for not wanting to work on it while installed in the MH. Way to difficult to work on when you have extremely limited access. Finding a knowledgeable and good small engine tech isn't easy either and the good ones are up to their eyeballs in work and don't come cheap.
Typically many shops will want the entire gen assy to be removed form the RV, if you had to pay someone to do that plus the cost to reinstall it would get even more expensive to the point it is cheaper to replace with new or like a lot of folks have done, use a portable gen instead.
