As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C-18 CHECK, A 1 1/8 INCH CRACK WAS FOUND IN UPPER FLANGE OF FRAME AT BS 344 ABOVE AND OUTBOARD OF STR 23 LT. MAINTENANCE CUTOUT DAMAGED SECTION OF FRAME FLANGE AT BS 344, FROM STR 22 LT TO STR 23 LT; FABRICATED A CHANNEL REPAIR DOUBLER; INSTALLED REPAIR PART IAW B737-300 SRM 51-70-11, FIG 1.