As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
18" CRACK ON THE RT SIDE OF THE ACCESSORY GEAR CASE (MAGNESIUM HSG) APPROX 180 DEGREES AROUND THE MAIN DIAMETER. THE CRACKING LEAD TO FLEXING OF THE ENGINE CASE CAUSING MAJOR INTERNAL RUB DAMAGE TO THE ROTATING GROUP AND STATIONARY COMPONENTS. THE CRACK WAS FOUND DURING TROUBLESHOOTING OF ENGINE RUNNING HOT. THE ENGINE DID NOT ACHIEVE TARGET TORQUE AND WAS BY PASSING FUEL AT MAX EGT.