What was found
AUTO PILOT DISCONNECTED ON DESCENT, AFTER 3RD TIME HAND FLEW AIRPLANE NOTICED A/C WOULD NOT TRIM. NO EICAS MESSAGES.COMPLETED STAB TRIM CHECKLIST. UNABLE TO GET STAB TRIM TO MOVE AND FROZEN AT 3.5 UNITS. DIVERSION TO PHNL WITH AN EMERGENCY DECLARATION. LANDING WAS WITHOUT INCIDENT AND NO ADDITIONAL PRECAUTIONARY ACTIONS. ON ARRIVAL, THE AIRCRAFT WAS GROUNDED FOR MAINTENANCE. FOLLOWING INSPECTIONS, EVIDENCE OF WEAR ON THE JACK SCREW ASSEMBLY AND SUSPECT BAD ROLLERS IN GIMBAL ASSEMBLY. STAB TRIM BALL SCREW ACTUATOR REMOVED AND REPLACED IAW BOEING 767-300 AIRCRAFT MAINTENANCE MANUAL 27-41-10. OPERATIONAL AND LEAK CHECK GOOD. NO ADDITIONAL FAULTS NOTED.