As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF ROW 13 SEATS A, B, C CAME LOOSE FROM THE FLOOR. *S/D* CAUSE UNKNOWN - AMIS ENTRY INDICATED A MISSING FOOT LOCK. FLEET ENGINEERING CONSIDERS THIS AN ISOLATED INCIDENT AND NO HISTORY EXISTS REGARDING LOOSE SEAT ASSEMBLIES AT THIS LOCATION. THE SEAT ASSEMBLY WAS REINSTALLED.