What was found
FLT 3796-BDL-ROC: MANUAL & STANDBY ELEVATOR TRIM JAMMED ON DESCENT OUT OF FLIGHT LEVEL 18,000 & UNJAMMED AT 11,000. ELEVATOR HORN HEAT ON THE ENTIRE TIME. ON GROUND WHEN RUNNING THROUGH TRIM RANGE, SNAGS AT FORWARD POSITION. MISTRIM NOSE DOWN INDICATION ON ID802 PANEL. MAINTENANCE TROUBLESHOT SYSTEM, FOUND THE LEFT ELEVATOR TRIM TAB ACTUATOR BINDING. REMOVED AND REPLACED TRIM ACTUATOR, SYSTEM CHECKED GOOD IAW DHC M/M CHAPTER 27.