As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON FLAP EXTENSION TO 15 DEGREES ON APPROACH TO OXR, BLUE SYSTEM HYDRAULIC FAILURE OCCURRED. FOLLOWED QRH. RETURNED TO LAX. REPLACED RIGHT NACELLE FLAP ACTUATOR PER MM 27-50-00. REPLACED RIGHT ENGINE HYDRAULIC PUMP. RUNUP AND OPS CHECK AND LEAK CHECK GOOD.