As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ABOUT 20 MINUTES AFTER TAKEOFF YELLOW SYSTEM HYDRAULICS PRESSURE AND QUANTITY FAILED ON ECAM AND OVERHEAD. FOLLOWED ECAM AND QRH PROCEDURES AND RETURNED. R & R A CHAFED YELLOW SYSTEM RT WING SUPPLY FLEX LINE IAW MM 29-00-00-04. CHECKED NORMAL, .ACCOMPLISHED BLEED OF YELLOW HYD SYSTEM COMPONENTS. CHECKED YELLOW SYSTEM FILTER CLOGGING INDICATORS. CHECKED NORMAL. RAN NR 2 ENGINE, OPERATED EDP. PUMP CHECKED NORMAL.