As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN FIRST DIGIT IS SELECTED AS "6" SOMETIMES "5" AND SOMETIMES "7" ARE TRANSMITTED INSTEAD. CLEANED CONTACTS AND WAFERS, REPAIRED, ALSO REPLACED V301 PHOTOCELL AND DETERIORATED R477 RESISTOR AND FOUND FREQUENCY AND POWER WOULD NOT ADJUST TO SPECS. REPLACED V101 OSCILLATOR. REPAIRED. BENCH CHECK GOOD.