What was found
DURING CLIMB RECIEVED A LEVEL NR3 HYD PUMP OFF ,10 MIN LATER LEVEL 1 HYD 3 OFF , TEMP WENT TO 104C. ACFT PERFORMED AIR TURNBACK. HSC LAST LEG FAULTED 3R PUMP, THEN 11 MINUTES LATER 3L PUMP , THEN HSC FAULT AFTER BOTH PUMPS OFF. INSPECTED FILTER BY-PASS INDICATORS ON ENGINE AND ON MANIFOLD. ALL INDICATE NORMAL. INTERROGATED MCDU FOR HSC NR3 ENG FAULTS. FOUND LEG1, 3L, 3R PUMPS OFF ALERT THEN ALL OTHER LEGS HSC. R & R HSC. RAN SYS 1,2,3 WITH AUX PUMPS ALL INDICATIONS OK. RAN ENGINES 1 AND 3 IDLE RUN AND SWITCHED LT AND RT PUMPS ON/OFF. ALL INDICATIONS CORRECT. RTS TEST OK. NO FAULTS. RETURN TO SERVICE.