As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING REMOVAL/INSTALLATION OF LT AND RT ENGINES, NOTED THAT AFT MOUNT SHAFTS AND AFT MOUNT FITTINGS FOR BOTH LT AND RT SIDES HAD CIRCUMFERENTIAL SCORING FROM COMING IN CONTACT WITH ONE ANOTHER. THE SHAFT AND FITTING ARE NOT TO COME IN CONTACT WITH EACH OTHER IAW MM PRACTICES. THE PROBLEM OCCURS BECAUSE THE SHAFT AND FITTINGS ARE NOT SOLD TOGETHER AS A PRE-MATCHED SET.