As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HYDRAULIC YELLOW ENGINE 2 PUMP LOW PRESSURE IN FLIGHT. RETURNED TO DEPARTURE. FOUND A HYD LEAK FROM YELLOW HP MANIFOLD FITTING PACKING. REPLACED THE PACKING IAW AMM 29-13-53-400-803A, PERFORMED A BLEED OPS AND LEAK CHECK OF YELLOW HYD SYSTEM IAW AMM 29-13-00. ACFT YELLOW RESERVOIR WAS NOT EMPTY ON ARRIVAL. NO FILTER DPI WERE TRIPPED. ACFT OK FOR SERVICE.