As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING 100-HOUR INSPECTION, NOTED EXCESSIVE BACKLASH IN AIR CONDITIONER DRIVE PULLEY. REMOVED DRIVE BRACKET INSTALLED UNDER STC SA00144AT. STUB SHAFT BETWEEN ENGINE AND DRIVE BRACKET WORN CAUSING PRE-LOAD ON ENGINE GEAR AND BEARINGS. THIS IS 3RD OCCURRENCE. COMPONENTS SHOULD BE REMOVED FROM SERVICE.