As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON LANDING AT EWR, AT TOUCHDOWN CAPT'S SEAT RETRACTED FULL DOWN ALL BY IT'S SELF. AFTER TAXI IN SEAT SEEMS TO HOLD OK. WIGGLED VERTICAL HANDLE WHILE IN THE UP POSITION AND SEAT WENT RIGHT DOWN TO FULL DOWN. VERIFIED PROBLEM. MAYBE HANDLE CAN BE ADJUSTED.