As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE TIRE SERVICING PRIOR TO FLIGHT, NOTICED LEFT MAIN TIRE TREAD WAS COMING OFF TIRE CASING. TIRE HAD TO BE CHANGED BEFORE FLIGHT. TIRE WAS AVIATOR 12-PLY AND TIRE PRESSURE AND TIRE TREAD LOOKED NORMAL. TIRE PRESSURE WAS BEING CHECKED AS PART OF NORMAL PRE-FLIGHT BY AN A & P MECHANIC. LANDINGS, 263.