As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TRIED ELECTRICAL & MANUAL TRIM, FOUND TO BE FROZEN. THE ELEVATOR WAS SHAKING. BOTH HAD TO PUSH FULL FWD ON THE YOKE TO ARREST THE CLIMB. IT FELT AS IF THE ELEVATOR WAS ALSO FROZEN. DECLARED AN EMERGENCY & REDUCED THROTTLES AS MUCH AS POSSIBLE TO DESCEND. ON REACHING 8500 FEET, THE TRIM THAWED & REGAINED FULL CONTROL. COMPLETED ALL APPROPRIATE CHECKLISTS & LANDED UNEVENTFULLY.