As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) INTERNAL EXAMINATION OF THE MAST REVEALED CORROSION APPROX 1/2 TO 2/3 UP FROM THE BOTTOM SIDE OF THE MAST BORE. CADMIUM PLATING APPEARED TO BE SEPARATING AND BLISTERING THE ZINC CHROMATE PRIMER. MAST WAS THEN STRIPPED, CLEANED, INSPECTED AND GIVEN A COATING OF AN IMPROVED CORROSIVE PROTECTOR.