As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED, A SLAT FAIL DURING APPROACH INTO DCA. DECLARED AN EMERGENCY AND DIVERTED TO IAD AND LANDED WITHOUT INCIDENT. MAINTENANCE WAS DISPATCHED TO THE AIRCRAFT TO TROUBLESHOOT. MAINTENANCE REMOVED AND REPLACED THE LT 2/3 O/B SLAT SKEW SENSOR AND PERFORMED OPS CHECKS PER EMB AMM. NO FURTHER FAULTS WERE FOUND AND THE A/C WAS RETURNED TO SERVICE.