A few comments about HWH...
When I talked to the guy at HWH who was more familiar with my equipment, I had a good feeling that my repairs would be handled appropriately.
Before sending in anything to HWH for repair or return, get an authorization (RMA) from HWH. It sounded like the authorization is a reservation for repairs. The firm in Yuma that I was using, Bob's Diesel, told me to send in my equipment without getting the HWH authorization. When I called the next week to check on the equipment repair schedule, they had placed my mailed box of equipment on a shelf because it had no authorization and, therefore, they did not know what to do with it. I was glad I called and got an authorization completed after its delivery. As it was, the repairs took about 1 1/2 months, including shipping to and from HWH.
I think the repairs would have been completed much sooner but for the initial lack of authorization, the reduced HWH crew size due to the Chinese Virus being in full force (May-June, 2020), and perhaps because my equipment was so old (nearly 20 years) that the older, more experienced technicians were staying away from the HWH workplace to avoid the Virus.
I say this extra delay was likely Virus caused because a few years earlier, my repair shop here near Hermiston had to send in the same HWH boards for repair. The equipment repair for that event took about two weeks, including shipping to and from HWH.