As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING GEAR RETRACTION, ON DEPARTURE FROM DCA STAB TRIM CAUTION MESSAGE ON ED1, RESET FAILED AS SOON AS YOKE TRIM SWITCH WAS MOVED, ANOTHER RESET WAS ATTEMPTED AND FAILED WITH TRIM SWITCH MOVEMENT, CONTROL FORCES WERE HARD AND GETTING WORSE. R & R MOTOR CONTROL UNIT IAW AMM 27-42-05.