Maybe they can't fix it. I've personally seen cases where these AVR/AVP cannot be fixed. If they admit that, would they have to give you a new one? I don't think they want to give you a new one.
As M Code, Phase 2, and others have said, many of these AVR/AVP's are made to be used and then discarded, not fixed and be reused.
Ah, see, if only I'd known BEFORE I bought the damn thing. Oh well. I also suspect it can't be fixed, that's probably why they were jerking me around on the troubleshooting & they accused me from like the first day of angling for a refund. Which surprised me, it's 3 years old, never occurred to me to ask for my money back.
Under the warranty, I do believe they would have been obligated to replace it or refund me if it could not be fixed. The funny thing to me is that they have these things made in China. They may sell it for 500 bucks, but I sincerely doubt that their costs are even half of that. So just replacing it would have been cheaper than a refund for them.
Then again, if they'd been honest and said they couldn't fix it, I probably would have wanted the refund, not a replacement that has the same parts.