As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF ACCELERATION, AND AGAIN DURING CLIMB, THE FIRST OFFIER`S SEAT SLID BACK FROM FLIGHT POSITION ALL THE WAY TO AFT TO THE SEAT TRACK LIMIT, DESPITE HAVING BEEN PREVIUOSLY LOCKED INTO THE DESIRED DETENT. MAINTENANCE REMOVED DEBRIS AND LUBRICATED THE SEAT TRACK AND ROLLER IAW AMM 25-11-01. OPS CHECKED GOOD.