As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR INFLIGHT T558 - LEFT HYDRAULIC PRESSURE INDICATION AS THEY ENTERED HOLDING. LEFT PRESSURE READ ZERO POUNDS PER SQUARE INCH. LANDED EWR WITHOUT INCIDENT. FOUND EXCESSIVE AIR IN LEFT AND RIGHT HYDRAULIC SYSTEMS. PERFORMED EXCESSIVE AIR CHECK AND BLED AIR FROM LEFT AND RIGHT HYDRAULIC SYSTEMS. SYSTEM GROUND CHECKED NORMAL OPERATION.