As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNCOMMENDED YAW DAMPER IN MOTION WAS DETECTED IN THE CLIMB AROUND 290 KNOTS WITH AP OFF C/W QRH AND IN DESCENT MOTION WAS DETECTED 2 TIMES AT 250 KNOTS SEVERAL NOSE TRIM REQUIRED. ENROUTE TO DTW ACFT DIVERTED DUE TO MAINTENANCE. EMERGENCY DECLARED AS A PRECAUTION, R & R YAW DAMPER ACTUATOR IAW AMM 22-22-01. OPS CHECK GOOD.