It really is enough of the Onkyoblow nonsense. It is one unit of many out there. Accessories4Less hasn’t stayed in business all of these years selling refurbished Onkyos. They can thank Denon/Marantz for their orchards full of lemons.
Diagnosing problems sight unseen without any firsthand information is more the practice of talk radio and TV “doctors” than that of any experienced, respectable physician. Perhaps leopards can change their spots, and not for better in this case, it seems.