As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - DURING C16 CHECK DISCOVERED CORROSION ON INTERCOSTAL SHEAR TIE BETWEEN STATIONS 727A AND 727B AT BL 17L IN THE AFT PIT. MAINTENANCE FOUND CORROSION TO BE OUT OF LIMITS IAW BOEING 737-300 SRM 53-00-04-1A1. REMOVED AND INSTALLED NEW FABRICATED SHEAR TIE BETWEEN STATIONS 727A AND 727B AT BL 17L IN THE AFT PIT IAW BOEING 737-300 SRM 51-40-02-0G FIG 12, 51-30-01-0G, AND BAC DWG 69-40708.