As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LHR - FLT 108 - BLUE HYDRAULIC RESERVOIR QUANTITY FELL TO RED DOT ON OVERHEAD AND MINIMUM ON ECAM. SERVICED BLUE HYDRAULIC SYSTEM. RAN ELEC PUMP AND TRANSFER PUMP ON GROUND FOR APPROX 90 MINUTES. ALL BLUE SYS ACTUATORS CHECKED FOR LEAKS. NR 1 ENGINE RAN 25 MINUTES. INSPECTED ALL CONTROL SURFACES. NO LEAKS FOUND. BLUE SYS QUANTITY CHECKED, NO DECREASE. OK FOR SERVICE. (X)