As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOG 7387973 - AIRCRAFT LOST LT HYDRAULIC SYSTEM QUANTITY/PRESSURE. THE CREW DECLARED AN EMERGENCY. AIRCRAFT RETURNED TO DEPARTURE. THE LANDING WAS UNEVENTFUL. MAINTENANCE DISCOVERED A HYDRAULIC LINE IN THE LT PYLON AREA CRACKED AT THE (B) NUT AND LEAKING. MAINTENANCE REPLACED THE LINE. OPS CHECK/LEAK TEST WAS GOOD.