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 WAG CORP. AIR CONDITION DRIVE PULLEY. REMOVED PN 100-H BRACKET FROM ENGINE. FOUND EXCESSIVE WEAR ON SPLINES CAUSING DAMAGE TO ENGINE. REMOVED PART FROM SERVICE. MANUFACTURER HAS NO KNOWN FIX FOR THIS PROBLEM. STC SA00144AT.