I'm not sure of all the legalese and logistics that go into doing warranty work but I'm tremendously satisfied with Timmons Auto & Truck Repair in Pleasant Hill. I'll post the link to their website below. I've had them do door repair, regular engine maintenance, miscellaneous stuff and been very pleased. They managed to scratch my slide out cover when they moved to their new shop and were a little green about moving a 40 footer out of the garage. No issue, waived the maintenance bill, ordered a new cover and had it installed less than two weeks later. This was a scratch I could barely even see. They do what they promise with high quality at a rational price. Whenever I go there, another motorhome is often around. Unlike some of the stories I read here and in IRV2.com, its never the same one twice.
Timmons Auto & Truck Repair - Services
Good luck and let me know how things turn out.