As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT TT: 999.1 HOURS. NR 1 ENGINE TT, 999.1 HOURS. DURING REPLACEMENT OF NR 1 HMU, FOUND CORROSION DAMAGE IN THE BORE ON THE HOUSING WHERE HMU IS INSTALLED. CORROSION DAMAGE WAS AT THE 6 O'CLOCK POSITION, AND RANGED FROM MINOR TO SOME DEEP PITS UP TO .140 INCH DEEP. ENGINE IS BEING REMOVED AND SENT FOR EVALUATION AND REPAIR.