I hear you Angelgz2,
Bought store demo RMB 1555 (Black) from now defunct dealer in 2020. Was assured warranty was like new. Trigger out function quit in 2023 and I contacted Rotel.
First, I was told unit not registered. Second, after proving registration on Rotel web site, was answered warranty started when dealer opened box and is not transferable (this is unlawful according to Quebec Consumer Protection law). Third answer was unit is out of warranty as s/n indicates built in June 2013 !
Hard to believe my s/n (200-3461027) refers to amp built a few months after official unveil of RMB 1555 in April 2013 !
Tried to start list of Rotel RMB 1555 (Black) serial numbers with purchase date but no one on forum responding !
However good SQ is with Rotel (and it is rather good) I will not re-purchase any of their products. There are enough as good or better units on the market to avoid such questionable business practices while still getting superior sound and normal warranty service.
Current and future Rotel owners beware !