As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(LOG 1346917) DURING INSPECTION FOUND CORROSION ON FLOOR BEAM AT UPPER CHORD STATION 947.5 RBL 50 AT PAX CABIN FLOOR STRUCTURE. FLOOR BEAM AT UPPER CHORD STA 947.5 RBL 50 AT PAX CABIN FLOOR STRUCTURE WAS REPAIRED PER B737-800 SRM 53-70-51 REP 5.