As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING ROUTINE INSPECTION OF THE NR 1 ENGINE IDG THE DRAIN PLUG WAS FOUND TO HAVE A CRACK AROUND WHERE THE HEAD MEETS THE SHANK. THE SHANK IS SEPARATING FORM THE HEAD. PICTURES ATTACHED PLUG REPLACED AND AIRCRAFT RETURNED TO SERVICE.