As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED IT WORKED INTERMITTENTLY. FOUND FREQUENCY OUT OF SPECS. ADJUSTED TO SPECS. WHEN UNIT WAS HEATED, FREQUENCY WENT OUT OF TOLERANCE AGAIN. REPLACED CAVITY OSCILLATOR V101. REPAIRED PROBLEM. COOKED UNER HEAT LAMP, VIBRATED AND PUT IN FREEZER. UNIT BENCH CHECK GOOD.