As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON REPLACING THE NR 1 VHF COMM RADIO ANTENNA DISCOVERED 3 CRACKS APPROX 1 IN LONG EMANATING IN A LONGITUDE DIRECTION FROM THE UPPER AND LOWER PORTION OF THE ANTENNA HOLE ON THE MOUNTING PLATE. THE MOUNTING PLATE IS LOCATED ON THE LT SIDE OF THE TAILBOOM ABOVE THE VOR LOOP ANTENNA. MFG REPAIR INSTRUCTIONS CALL FOR 321 STAINLESS STEEL 1.2 MM THICK AND FAILED MOUNTING PLATE APPEARS TO BE 0.063" ALUMINUM. CAN NOT TELL THE HARDNESS. TT ON THE MOUNTING PLATE IS UNKNOWN BUT DOES NOT APPEAR TO BE ORIGINAL.