What was found
DURING CLIMB OUT, A/C EXPERIENCED RUNAWAY STAB TRIM. TRIM SWITCHES WERE POSITIONED TO CUT OFF, THIS DISENGAGED PITCH CTRL PADDLE SWITCH TO AUTOPILOT. AC JERKED NOSE UP, BEGAN EXCESSIVE CLIMB OF RATE AT WHICH TIME AUTOPILOT WAS DISENGAGED. AOM CHECKLIST, MN STAB TRIM WAS RE-ESTABLISHED, DECLARED EMERGENCY. AC AIR TURN BACK, LANDING WAS MADE USING MN ELECTRIC TRIM WITHOUT INCIDENT. INSPECTED STAB TRIM CONTROLS, FOUND CRUISE TRIM MOTOR CONTINUING IN MOTION. CYCLED CRUISE TRIM SWITCH, MANUAL WHEEL THROUGH SEVERAL TIMES FULL NOSE UP AND DOWN AND SYS OPS CHECK NORMAL. CLEANED TRIM SWITCHES, INSPECTED RELAYS, RESECURED LOOSE TERMINAL NR 14 ON R-27 CTRL RELAY. OPS SYS CHECKS WELL. AC RETURNED TO SERVICE. (K)