As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - DURING C15 CHECK, DISCOVERED .5 INCH CRACK IN AFT CARGO COMPARTMENT STRINGER TIE AT BS 727D STRINGER 23L. REMOVED STRINGER TIE IN AFT CARGO COMPT BS 727D STRINGER 23L IAW BOEING 737-300 SRM 51-40-02-0G FIG 8. FORMED NEW STRINGER TIE CLIP IAW BOEING DRAWING 69-35-352 AND BOEING 737-300 SRM 51-40-05-0G FIG 3. INSTALLED STRINGER TIE AT BS 727D STR 23L IAW BOEING 737-300 SRM 51-40-02-0G FIG 7 AND FIG 12.