As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STABILIZER TRIM JAMMED DURING FLIGHT AT -2.3 POSITION ON EICAS TRIM CLACKER WAS HEARD AT FIRST INTERMITTENTLY THEN ALMOST CONTINUOUSLY WHILE STAB REMAINED AT -2.3 POSITION. ONCE DESCENT WAS INITIATED STABILIZER UNFROZE AND SUDDEN PITCH CHANGE OCCURRED SOME SCUFFING APPARENT ON VERTICAL STABILIZER ON LEFT SIDE AT THE LEADING EDGE OF THE STAB. ITEM IS UNDER INVESTIGATION.