As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - MAJOR REPAIR - DURING C-21 CHECK FOUND 3 CRACKS .271 INCHES LONG AT FRAME WEB STA 178 WL 230 RBL 17.1. MAINTENANCE REMOVED DAMAGED AREA FROM FRAME WEB STA 178 WL 230 RBL 17.1 AND FABRICATED WEB AND TAPERED SHIMS IAW BOEING 737-300 SRM 53-10-08-2 FIG 212. INSTALLED FABRICATED PARTS AT FRAME WEB STA 178 WL 230 RBL 17.1 IAW BOEING 737-300 SRM 53-10-08-2 FIG 212.