As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING OVERHAUL THE FREEWHEEL ASSEMBLY, IT WAS NOTICED THAT A LARGE CRACK HAD FORMED UNDER THE O-RING GROOVE OF THE CHIP DETECTOR HOUSING. SHOULD THE CRACK HAVE CONTINUED AND THE CHIP DETECTOR HOSING HAD BROKEN FREE OF THE FREEWHEEL UNIT, OIL UNDER PRESSURE FROM THE MAIN TRANSMISSION WOULD HAVE BEEN EXPELLED FROM THE FREEWHEEL ASSY.