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-16 CHECK A 1/4" CRACK WAS FOUND ON AFT SIDE OF THE AFT CABIN FRAME BS 907, BETWEEN STR 1 & 2 R/H. MAINTENANCE CUTOUT CRACKED AREA OF AFT CABIN FRAME BS 907; FABRICATED A REPAIR CHANNEL AND FILLER; INSTALLED REPAIR PARTS IAW B737-300 SRM 51-70-11, FIG. 1, PG. 1-6.