As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF ROLL CG 10.47, FLAP 4 AT APPROX 120 KTS, THE NOSE STARTED TO COME UP. PILOT PUSHED YOKE FWD TO FULL FWD & NOSE STILL CAME UP, TAKEOFF ABORTED. ADDITIONAL CORRECTIVE ACTION INFO FOR CONTROL NR WX0A2015081972822. FOUND MISSING COTTER PIN FROM LT ELEVATOR BOOST CYLINDER TO CONTROL TAB. REMOVED LT ELEVATOR ACTUATOR & INSTALLED LT ELEVATOR ACTUATOR IAW AMM 27-30-08.