What was found
DURING CLIMBOUT, RECEIVED A HYD SYS LOW PRESSURE ECAM ON THE YELLOW SYSTEM, THE FLUID LEVEL IN THE YELLOW SYSTEM WAS AT THE RED LEVEL. ACCOMPLISHED ECAM AND QRH PROCEDURES. RETURNED TO DEPARTURE. FOUND YELLOW HYD SYSTEM FLEX PRESSURE LINE JUST AFT OF RIGHT MAIN GEAR TRUNNION LEAKING. REPLACED THE LINE IAW AMM 20-23-11.