As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING THE 100 HOUR INSPECTION THE BOLT HOLDING THE ENGINE TO THE TAIL ROTOR DRIVE FLANGE HAD LOOSENED OFF AND THE FLANGE HAD MOVED AFT AND RUBBED AGAINST THE FIBREGLASS FIREWALL AND BRACKETS. THIS WAS FOUND AGAIN ON THE 500 HOUR. EUROCOPTER HAVE SINCE ISSUED AN ALERT SERVICE INFORMATION LETTER REGARDING THIS PROBLEM.