What was found
LHR - AFTER TAKEOFF YELLOW SYSTEM HYDRAULIC RESERVOIR AIR LIGHT ILLUMINATE FOLLOWED BY LOSS OF YELLOW SYSTEM PRESS REPEAT OF PIREP N074. REPLACED YELLOW SYSTEM NON-RETURN VALVE FOR HEAD PRESSURE LEAK CHECK AND OPS CHECK NORMAL. (M)
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
LHR - AFTER TAKEOFF YELLOW SYSTEM HYDRAULIC RESERVOIR AIR LIGHT ILLUMINATE FOLLOWED BY LOSS OF YELLOW SYSTEM PRESS REPEAT OF PIREP N074. REPLACED YELLOW SYSTEM NON-RETURN VALVE FOR HEAD PRESSURE LEAK CHECK AND OPS CHECK NORMAL. (M)