SERVICE FAILURE AT "McBride's RV" (Chino, CA)

RV Service Centers are a good choice if your roof needs resealed, your absorption fridge is acting strange, winterizing or other RV specific items but getting service for a diesel power train or chassis seems to be very suspect. The OP's coach, at least per his profile, is a 2001 American Coach Tradition with a Cummins 8.3 built on a Spartan Chassis. Even with a price point that the he was searching out a diesel shop might have been a better choice for the described service.

AAMCO commercials from the 70's drives my point a bit. My favorite has always been THIS one.