As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY DECLARED. RETURNED TO FIELD. DURING FLIGHT RECEIVED EICAS HYD QTY LOW MESSAGE ACCOMPLANIED BY AN INDICATION OF SLOW LOSS OF FLUID INDICATED. IT WAS DETERMINED THAT THE LEFT HYDRAULIC QUANTITY INDICATION WAS ON MEL AND PLACARDED PER 29-9 AUTH: 4-421DC-C.