As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED FLAP FAIL MSG ON APPROACH INTO DCA. CREW DECLARED AN EMERGENCY AND DIVERTED TO IAD. THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE PERFORMED ELECTRICAL RIG OF FLAP SYSTEM PER EMB AMM. OPS CHECK GOOD, AND THE A/C WAS RETURNED TO SERVICE.