Navomatic 400

[cessnadriver]

Hello ALL.
I was sent replies about shops that still work on the 400 auto pilot. I deleted them by mistake. Please reply again. I did contacted Autopilot Central in Tulsa. They replied saying they no longer supported the 400?? They could bench check mine but if parts are needed they may not be available. So that why I need other shops information. The replies I received the other day mentioned a shop in Illinois or Indiana? Which are closer that Tulsa.
Thanks.
Regards.
BILLS
'65 C337 owner, pilot and A&P