I'm told you have to have an FAA approved manual for the unit to open
it.

Really? Find an FAA approved manual for any radio without a TSO. Narco?
King? Icom? Microair? You won't find an "approved" manual for (literally)
hundreds of models from dozens of manufacturers.




The manufactor has keep those manuals secret (like Garmin does) so
you have to send it to the factory. However, the factory will no
longer look at it. Are you saying you would be willing to open the
unit and service it for me???


Not without a service manual, approved or otherwise. Not for legality, but
for tech data necessary to service.


Jim