As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FLIGHT CAPTAIN'S SEAT DROPPED TO THE FLOOR. VERTICAL ADJUST DOESN'T SEEM TO BE LOCKING. INSPECTED, LUBED CAPTAIN'S SEAT ASSEMBLY UP AND DOWN LOCKING PINS AND LINKAGE CONTROL CABLE. OPS CHECKED GOOD. SEAT WAS REPLACED AS A PRECAUTIONARY MEASURE AT ILN IAW DC-9 MM 25-10. SEAT OPS CHECKED GOOD.