As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2700 - EWR - FLIGHT CREW REPORTED NR 1 HYD LOW QTY MESSAGE ON EICAS DURING CLIMB. CREW PERFORMED AIR RETURN AND LANDED ACFT UNEVENTFUL. EWR MX SERVICE HYDRAULIC SYSTEM AND PERFORMED OPERATIONAL CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.