As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF AND PASSING THROUGH 5000 FT, CREW EXPERIENCED A STABILIZER TRIM RUNAWAY, FOLLOWED BY A FAILURE OF THE MAIN AND STANDBY TRIMS AS INDICATED BY EICAS MESSAGES. CREW COMPLETED STABILIZER TRIM RUNAWAY, AND STABILIZER TRIM FAILURE QRC PROCEDURES. RETURNED TO AIRPORT AND DECLARED AN EMERGENCY, LANDED WITHOUT INCIDENT. MAINTENANCE FOUND CAPTAINS CONTROL WHEEL TRIM SWITCH HAD FAILED. SWITCH WAS REPLACED AND AIRCRAFT RETURNED TO SERVICE.