As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED FLAPS FAIL AT 8°. AIRCRAFT LANDED IN DCA WITHOUT INCIDENT. MX PERFORMED FAULT ISOLATION OF FLAP SYS USING THE ACFT FAULT ISOLATION MANUAL. MX REMOVED AND REPLACED THE FLAP ELECTRONIC CONTROL UNIT IAW THE ACFT MM. CHECKS WERE MADE IAW THE ACFT MM AND ACFT WAS RELEASED FOR SERVICE.