As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YXD - DURING REPAIR OF CRACKS TO STRINGER 727 (SEE MRR NR 00066) FOUND STRINGER 18R DAMAGED BY STOP DRILL AT BS 756.9 AND BS 753 DIAMETER .3125 INCH, DEPTH .020 INCH. REPAIRED STRINGER 18R WITH STRINGER SPLICE PER BOEING SRM 53-10-3 PAGE 10 FIG 1 SHEET 8 WORK ACCOMPLISHED ON NON-ROUTINE NR 0416. (M)