As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE CHECK CENTER FUSELAGE UNDERNEATH FLOOR BOARD CANTED PRESSURE DECK BETWEEN STA 1240 AND 1260 RH SIDE FASTENER CORRODED. REMOVED AND REPLACED FASTENERS AT CENTER FUSELAGE UNDERNEATH FLOOR BOARD CANTED PRESSURE DECK BTWN STA 1240 AND 1260 RH SIDE IAW B747-400F SRM 51-40-02-06-0. THE AIRCRAFT WAS APPPROVED FOR RETURN TO SERVICE.