As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING THE BALANCING PROCEDURES OF THE MAIN DRIVE SHAFT AND THE FAN SHAFT ON THE NR 1 ENGINE. TWO CRACKS WERE NOTICED ON THE OIL COOLER BLOWER MOUNTING SUPPORT AT THE 6 AND 9 O`CLOCK POSITIONS. THE SUPPORT WAS REMOVED AND REPLACED WITH AN OEM NEW SUPPORT.