As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
3RD DIGIT OFF WITH "1" SELECTED. ATC SHOWS "5". PERFORMED PRELIMINARY INSPECTION, COULD NOT DUPLICATE PROBLEM. FOUND UNIT STAYS "ON" IN "OFF" FUNCTION. TROUBLESHOT AND FOUND Q2 TRANSISTOR BAD. SENT TO ALLIED SIGNAL AVIONICS FOR INSPECTION AND REPAIR.