As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, A PASSENGER TIGHTENED HIS LAP BELT AND THE INBOARD ATTACHMENT END CAME OUT FROM BETWEEN THE SEAT CUSHIONS, JUMPED UP FROM SEAT NR 7 AND SAT IN SEAT NR 5 AND BUCKLED THE LAP BELT. WHEN WENT TO TIGHTEN THAT BELT, THE INBOARD ATTACHMENT END CAME OUT FROM BETWEEN THE SEAT CUSHIONS.