As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE DOING ROUTINE MAINT, FOUND EXCESSIVE PLAY IN ACCESSORY DRIVESHAFT, AND THE ACCESSORY DRIVE COUPLING AT THE ENGINE WAS THE CAUSE OF THE EXCESSIVE PLAY. THERE WERE NO PUBLISHED LIMITS FOR THIS COMPONENT. ROLLS ROYCE WAS CONTACTED AND THEIR ENGINEERING SUSPECTED THAT INTERNAL VIBRATION WAS CAUSING EXCESSIVE WEAR OF THE ACCESSORY OUTPUT DRIVE COUPLING BEARING. IF PLAY IS FOUND IS THIS AREA. (X)