As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE TROUBLESHOOTING FOR AN UNCOMMANDED AUTOPILOT PITCH UP WHEN THE FLAPS WERE RETRACTED FROM 1 TO ZERO, A DISCREPANCY WAS DISCOVERED IN THE LT INBOARD ELEVATOR POWER CONTROL PACKAGE. WITH ALL HYDRUALIC POWER OFF TO THE TAIL AND CONTROL COLUMN IN THE FULL FORWARD POSITION, WHEN THE NR 3 AND NR 4 HYDRAULIC SYSTEMS WERE PLACED ON (ONE AT A TIME), THE LT INBOARD ELEVATOR WENT TO THE FULL DOWN POSITION RAPIDLY. CHANGED ELEVATOR PCP AND FLIGHT TESTED OK.