As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND THE HSG OF THE MOTOR TO ITS MOUNTING FLANGE LOOSE AND CHUCKING. MOTOR HAD OBVIOUSLY BEEN TAMPERED WITH, SCREW HEADS WERE GALLED AND MOTOR HSG HAD CHAFE OR WEAR MARKS AS IF IT HAD BEEN INSTALLED IN AN ACFT. ORDERED NEW PART FOR INSTALL. (K)