As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C20 CHECK DISCOVERED CORROSION ON THE AFT BAG PIT THRESHOLD INBOARD SUPPORT FILLER, LOWER SURFACE AT BS 802, BL 16R. MAINTENANCE REMOVED CORROSION AND FOUND TO BE OUT OF LIMITS IAW BOEING 737-300 SRM 53-60-15-1A FIG 101. REMOVED FILLER AND INSTALLED NEW SUPPORT FILLER AT BS 802 AND BL 16R IAW BOEING 737-300 SRM 51-40-02.