As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C13 CHECK DISCOVERED LEVEL 2 CORROSION ON THE AFT PIT STRINGER CHANNEL AT BS 907 AND STRINGER 27L. MAINTENANCE REMOVED CORROSION AND FOUND TO BE OUT OF LIMITS IAW BOEING 737-300 SRM 53-00-03-1A1. REMOVED AND FABRICATED CHANNEL IAW BOEING 737-300 SRM 51-40-02-0G AND BOEING DWG 65-45895. INSTALLED FABRICATED REPAIR PARTS AT BS 907 AND STR 27L IAW BOEING 737-300S SRM 51-40-02-0G.