As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED HYD SYS 2 EDP FAIL ON APPROACH INTO DCA. CREW DECLARED AN EMERGENCY AND DIVERTED TO IAD. THE A/C LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE LT MLG SIDE STAY DOWNLOCK UPPER SWIVEL PER EMB AMM. OPS CHECK GOOD.