I do know a guy! But here‘s the full story:
Back around 2017 or 18 I went to a now defunct site called pcenginefx.com, where I heard there was a user named Keith Courage who buys junk PC Engine systems in bulk, recaps, retrobrights, polishes, and restores them to absolute glory. He also works on the cd systems, replacing cogs and moving parts like a pro! To top it off, he provides them at reasonable prices. This man would certainly be capable and willing to fix your console.
I purchased a full PC Engine CD System2 briefcase unit, reasonably priced. It was indeed glorious. I later resold it for more than I purchased it for, and bought a second PC Engine unit from the same guy, Keith Courage.
Now, that site is gone, but I still have my e-mail threads with Keith Courage.
After some quick googling just now, I heard that the forum had it’s issues as well, with crazy admins and such. Typical stuff tbph. Apparently many users moved to https://pcengine.proboards.com/ , and it‘s worth searching for user Keith Courage there, although I would be unable to verify that it’s the same dude, so it would require reading threads a ton.
Unfortunately the e-mail thread I have is all notifications of Private messages from the pcenginefx forums, and I'm unable to acces any of the information exchanged.
So, try that new forum, use your own discretion. I also have connects to several other dudes-at-large in the retro gaming scene who do excellent repairs, but they have very long wait times, months and months.