[Milsurplus] Motorola/General Dynamics UHF ATC Receiver CM-200 help

[Skywarrior]

Hi All,
I am hoping someone on this list has knowledge of this Air Traffic Control UHF (225-399.975 MHz) radio.  I have 2 that are both deaf although everything seems to be working correctly.  I am looking for someone to troubleshoot and repair or for a source of a manual for them.
Any help will be greatly appreciated.

Bruce