As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING WALK AROUND CHECK, FOUND SEVERAL CRACKS COMING FROM THE SKIN, ON THE OUTER SLEEVE OF THE LONG FIXED CORE EXHAUST NOZZLE (LFCEN) ON THE NR 4 ENGINE. THE CRACKS ARE APPROX AT THE 7 O'CLOCK POSITION. REF FIG 1. REMOVED ANY BURRS AND STOP DRILLED CRACK ENDS USING STANDARD PRACTICES AND ELEMENTARY OPERATIONS.