As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TORQUE FLUCTUATIONS. FOUND LOOSE PLUG ON AFT SLIDE OF COMPRESSOR STUD, HIDDEN DAMAGE FOUND WORN BUSHINGS ON OIL PUMP BODY AND WORN JOURNALS ON OIL PUMP SPUR GEAR. INSTALLED SERVICEABLE GEAR BOX HOUSING, NEW OIL PUMP SPUR GEAR AND PUMP BODY, OVERHAULED GEARBOX.