As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TRANSPONDER KNOB BROKEN OFF. PERFORMED PRELIMINARY INSPECTION. REPLACED KNOB. REPAIRED. REPLACED BLOWN FUSE F401 AND CAVITY TUBE V101 DUE TO LOW POWER OUT. ADJUSTED FREQUENCY, COOKED UNIT, VIBRATED AND PUT IN FREEZER. BENCH CHECK GOOD.