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-19 CHEC, INTERCOSTAL FOUND CRACKED AT BODY STATION (BS) 500D THROUGH BS 520. MAINTENANCE REMOVED TOP OF INTERCOSTAL AT BS 500D-520 AND FABRICATED ATTACH ANGLE FOR TOP OF INTERCOSTAL IAW BOEING SRM 51-40-02. INSTALLED FABRICATED PART IAW BOEING 737-300 SRM 51-40-02.