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the bad power can eventually damage many, many other components. I'm afraid my processor board may have been damaged too.
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This is one of the things that happens if the unit is used too long, or too many times, after first presenting symptoms. How long did yours go on with intermittent issues before it became so bad that you needed to repair it? In most cases, it tends to be within 4-6 months after first presenting issues.
The #1 way to give these units a longer life it so make sure the "power save" (power vampire) mode is set properly. I don't recall if that is enabled or disabled, but when set properly, the unit goes completely black after maybe 5 minutes. The clock does not run.
(Trivia: At the time, when we still lived in an analog TV era, people complained about the inability to use timer recording. That, of course, led to the early deaths of their recorders. In our post-analog DTV era, there's no reason to use timer mode anyway.)
The odds of getting JVC to release firmware to a consumer directly are on par with buying a winning lottery ticket. To be quite blunt, they're SOBs for their refusal to assist long-term customers. They'd rather you call it junk and buy something new, not caring one bit about the fact that the LSI chipset is unavailable.
Your best option is two take two or more machines, cannibalize for parts, and built a new good unit. Don't junk it.