As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GYR - MAJOR REPAIR - DURING C20 FOUND INTERGRANULAR CORROSION ON FORWARD BAG PIT THRESHOLD SILL WEB FROM BS 400 TO BS 450 AND FROM BL 28R TO BL 48R. MAINTENANCE REMOVED WEB AND FABRICATED NEW WEB IAW BOEING 737-300 SRM 51-30-01. INSTALLED WEB IN THE FORWARD BAG PIT FROM BS 400 TO BS 450 AND FROM BL 28R TO BL 48R IAW BOEING 737-300 SRM 51-20-01.