What was found
(CAN) THE CREW REPORTED PROBLEMS WITH BOTH CREW SEAT VERTICAL ADJUSTMENT, AFTER INVESTIGATION, FOUND TWO HYDROLOCKS BROKEN AT THE END OF THE THREADED PORTION. (SEE PICTURES) ON THE PILOT SEAT THE SECOND HYDROLOCK WAS EMPTY, AND THE ONLY THING THAT AVOID THE SEAT TO DROP TO A FULL DOWN POSITION WAS THE BROKEN HYDROLOCK STUCK IN THE CARPET. THE DEFECTIVE HYDROLOCKS PN AND SN ARE: PN 871544-405, SN 09-6524M1-01-0002, SN 06-3853-01-0004.