As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DME WOULD NOT WORK ON SEVERAL CHANNELS. THE AIRCRAFT WAS RECENTLY DELIVERED FROM MANUFACTURING AND WAS MISSING JUMPER IN CONTROL HEAD K1572 BETWEEN PINS 30 AND 47. THIS APPEARS TO BE A REVISION THAT WAS NOT INCORPORATED BY THE INSTALLER. THE OLD INSTALL MANUAL DOES NOT INDICATE THIS JUMPER.