As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLYING RDU - LGA, CREW RECEIVED A HYD 2 LO QTY MESSAGE, FOLLOWED BY A HYD SYS 2 FAIL MESSAGE. CREW DECLARED AN EMERGENCY, USED THE ALTERNATE GEAR EXTENSION LEVER TO LOWER THE GEAR AND DIVERTED TO EWR WHERE THEY LANDED WITHOUT INCIDENT. AIRCRAFT WAS PULLED VIA TUG INTO GATE WHERE PASSENGERS DEPLANED. MAINTENANCE FOUND LINE IN LEFT HAND PYLON TO HAVE BROKEN CLAMP AND RUB THRU. MAINTENANCE REMOVED AND REPLACED PRESSURE RETURN LINE PER AMM AND OPS CHECKED GOOD.