As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THE STAB AND MACH TRIM FAILED ON TAKEOFF. CREW ELECTED TO RETURN TO CHO AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE F/O'S CONTROL WHEEL. MAINTENANCE CLEANED THE HORIZONTAL STAB TRIM SWITCHES ON F/O'S CONTROL WHEEL. MAINTENANCE PERFORMED OPERATIONAL TESTS OF THE HORIZONTAL STAB TRIM SYSTEM IN ACCORDANCE WITH THE AIRCRAFT MAINTENANCE MANUAL 27-40-00-710-801. OPS TESTS GOOD. AIRCRAFT WAS RELEASED FOR SERVICE.