As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN'S SEAT UNLOCKED DURING TAKEOFF. INSPECTED TRACK AND LOCK MECHANISM. FOUND SOME DEBRIS ON THE TRACK. CLEANEDTRACK AND LUBED LOCK MECHANISM. OPERATED SEAT ON THE SEAT TRACK SEVERAL TIMES. OP CHECK GOOD. MM TO BE REVISED TO ADD SPECIFIC TRACK AND LOCK MECHANISM CLEAN AND LUBE TASKS (ATB-CHECK) TO HELP PRECLUDE THIS TYPE OF OCCURRENCE. TRACK CONDITION CHECKS ALREADY IN PLACE.