As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5261 - AFTER TAKEOFF FROM RIC THE STAB AND MACH TRIM DROPPED OFF, FLIGHT RETURNED TO THE FIELD. CLEANED THE STAB TRIM SWITCHES ON YOKES AND PERFORMED AN OPERATIONAL AND FUNCTIONAL TEST OF STAB TRIM CHANNEL 1 AND 2. DISCREPANCY COULD NOT BE DUPLICATED BY MAINTENANCE.