As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 7707 IAD TO IAH ON DESCENT A -HYD 1 LO QTY- MESSAGE WAS ANNUNCIATED ON THE EICAS. CREW NOTED THE FLUID IN THE NR 1 SYSTEM WAS AT 16 PERCENT, AND DECREASING BY 2 PERCENT EVERY 3-4 MINUTES. CREW RAN QRH PROCEDURE. LANDING AND TAXI TO THE GATE WERE UNEVENTFUL. MAINTENANCE REMOVED AND REPLACED NR 1 EDP.