As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 0177 - EN ROUTE JFK-SFO - CENTER HYDRAULIC QTY EICAS MESSAGE ILLUMINATED IN FLIGHT. ALL PUMPS WERE TURNED OFF WITH QTY STOPPING AT 46. LOWEST FLUID WAS 20. DECLARED EMERGENCY, AIR INTERRUPTED AND LANDED ORD WITHOUT INCIDENT. REPLACED CENTER HYDRAULIC FUSE. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)