As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AIRCRAFT 5646, L/P 0759203) CORROSION IN THE MAIN CABIN FLOOR STRUCTURE SUPPORT CHANNEL, UPPER SURFACE, BETWEEN BS.355.5 TO BS.365.5 LBL.62.0 CP53-221-01I DOT 129-003. FABRICATED SUPPORT CHANNEL FROM 70750 P.O # FC1800007 AND HEAT TREATED TO T6 IAW BDRW 141N5170 REV C AND 4TW0127 WO#11335 FROM HI TECH WELDING. INSTALLED CHANNEL SUPORT IAW B577 SRM 51-40-02.