As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
KNOB WILL NOT TURN TO TEST. VERIFIED. REPLACED FACEPLATE ASSEMBLY DUE TO KNOB BROKEN. INSTALLED HEATSINK DUE TO SERVICE BULLETIN KT76A-6. REPLACED CAVITY OSCILLATOR V101 DUE TO WEAK POWER. REPLACED V301 PHOTOCELL DUE TO BEING WEAK. REPLACED DETERIORATED R477 RESISTOR.REPAIRED.