What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) The transponder antenna cable connector had vibrated into a position where it came into contact with the alternator terminal buss bar. This caused a short and the insulation on the antenna cable got hot and started smoking. The cause of the antenna cable movement, other than possible clamp breakage, was not determined. Radio shop is to inspect and issue m or d when cause is determined.
As the FAA filed it
(-23) THE TRANSPONDER ANTENNA CABLE CONNECTOR HAD VIBRATED INTO A POSITION WHERE IT CAME INTO CONTACT WITH THE ALTERNATOR TERMINAL BUSS BAR. THIS CAUSED A SHORT AND THE INSULATION ON THE ANTENNA CABLE GOT HOT AND STARTED SMOKING. THE CAUSE OF THE ANTENNA CABLE MOVEMENT, OTHER THAN POSSIBLE CLAMP BREAKAGE, WAS NOT DETERMINED. RADIO SHOP IS TO INSPECT AND ISSUE M OR D WHEN CAUSE IS DETERMINED.