As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CENTER (AISLE) FLOOR PANEL WAS REMOVED FOR MAINTENANCE AND THE JOINT STRIP (REFERENCE IPC 53-00-47, FIGURE 5B, ITEM 375) WAS NOT INSTALLED AT FUSELAGE STATION 693.3 (BETWEEN FLOOR PANELS 251BLF AND 261 AFL). THE JOINT STRIP PROVIDES A METHOD FOR THE FLOOR PANELS TO JOIN THE FORWARD / AFT ENDS OF FLOOR PANELS AND PROVIDE SUPPORT AT THESE JUNCTIONS. PERMANENT REPAIR IAW STS ENGINEERING EA 5-2010-318.