As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - C21 CK - C - BS 178 PRESS BULKHEAD CENTER WEB .7 INCH CRACK, WL 218, RBL 11.7 TO RBL 12.7, BELOW REINFORCEMENT DETECTED BY ULTRASONIC INSPECTION. MAINTENANCE CUT OUT DAMAGED AREA OF WEB AND FABRICATED REPAIR DOUBLER AND FILLER AND INSTALLED IAW B737 SRM 53-10-11 FIG 1 PG 1 - 8.