What was found
DESCENDING THROUGH 43,000’ WE GOT A YELLOW TRIM MISCOMPARE ANNUNCIATION ON BOTH PFD’S FOLLOWED BY A RED TRIM MISCOMPARE ON BOTH PFD’S. I WAS PF AND DISCONNECTED THE AUTOPILOT. THE AIRPLANE JUMPED NOSE UP. I CAUGHT IT AND BROUGHT IT BACK TO A STABILIZED DESCENT. I COULD NOT MOVE THE MANUAL TRIM WHEEL EITHER DIRECTION. ASKED FOR AND WERE GIVEN A LEVEL OFF AT 42000 TO WORK OUT THE PROBLEM. HAVING TO PUSH VERY HARD TO OVERCOME THE NOSE UP TRIM AND STAY LEVEL. GAVE THE TRIM WHEEL A HARSH PUSH AND GOT A LITTLE RELIEF. HAVING TO USE BOTH HANDS TO KEEP THE AIRPLANE LEVEL. (RS,PM) REACHED OVER AND ALSO GAVE THE WHEEL ANOTHER HARD NOSE DOWN PUSH AND WAS ABLE TO GET A LITTLE MORE RELIEF. LUBRICATED LT /RT ELEVATOR TRIM TAB ACTUATORS IAW 12-21-01. OPS CHECKS GOOD IAW MM 27-30-01, GOT OUT THE QRH AND REFERRED TO T3 ELECTRIC ELEVATOR TRIM INOPERATIVE.