As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED ENGINE VIBRATION WITH NR 1 GENERATOR FAILURE. INSPECTED ENGINE FOUND GENERATOR MOUNTING ADAPTER COMPLETELY FAILED. GENERATOR HANGING FROM WIRES AND RUBBING ON STANDBY GENERATOR DRIVE PULLEY AND BELT. SUBMITTER STATED EXACT CAUSE UNKNOWN AT THIS TIME, APPEARS ADAPTER DEFECTIVE, MAY HAVE BECOME PORUS. RECOMMEND SHIELD TO PROTECT STANDBY GENERATOR DRIVE. MFG PART NR Z00N6000707222TBM.