As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 449 - EWR - THE AIRCRAFT EXPERIENCED DUTCH ROLL IN FLIGHT FROM DCA TO EWR. THE YAW DAMPER SYSTEM WAS PLACARDED INOPERATIVE AT THE TIME. THE AIRCRAFT LANDED SAFELY AT EWR. THE YAW DAMPER COUPLER WAS REMOVED AND REPLACED PER MM 22-12-31 AND OPERATION CHECKED GOOD. THE YAW DAMPER PLACARD WAS REMOVED. FAILURE HAS BEEN CONFIRMED. TEARDOWN FINDINGS REVEALED THAT THE RATE GYRO WAS AT FAULT. (M)