As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON INSPECTING AIR CONDITIONING DRIVE PULLEY AND SPLINE IN ACCORDANCE WITH AIR COMM SB206EC-18-07 AND AIR EVAC MIL 356. IT WAS DISCOVERED A/C DRIVE PULLEY TO BE WORN BEYOND LIMITS. DRIVE PULLEY WAS REPLACED AND INSTALLED IN ACCORDANCE WITH MIL 356 AND SB206EC-18-07. NO DEFECTS NOTED.