As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SUSPECT PITCH TRIM JAM ON DEPARTURE. STABILIZER WOULD NOT MOVE FROM 7.7 DEGREES POSITION CAUSING THE CREW TO SIGNIFICANTLY USE FORCE ON ELEVATOR CONTROL AND DECREASE ENGINE THRUST TO LEVEL OFF. RETURNED TO DEPARTURE AIRPORT KIAD WITHOUT FURTHER INCIDENT