Late to the party, but as far as I know, Ellison Avionics in Waco, TX still works on these as well, and they're darn good folks to work with. Replaced every internal component in mine for under $500 shipped back in 2018. Highly recommend them if anyone else needs theirs repaired.

http://ellisonavionicsservices.com/index.html

States I landed in N63420 while he was mine:
[Linked Image from visitedstatesmap.com]
KDCY

"Flying a plane is no different from riding a bicycle. It's just a lot harder to put baseball cards in the spokes." - Captain Rex Kramer