As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD CREW REPORTED INDICATION OF SYS A HYD QUANTITY LOSS. EMERGENCY DECLARED FLIGHT LANDED IAD WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND A HOLE IN THE RT HAND MLG UPLOCK ACTUATOR SUPPLY LINE. REPLACED LINE & SERVICED HYD SYS. SYS GND CHECKED NORMAL OPERATION CLOSED.