What was found
AT FL 370 BLEED VALVE NR 2 FAULTED. TURNED IT OFF AND OPENED BLEED CROSS FEED. APPROX 1 MIN LATER BLEED VALVE NR 1 FAULTED. TURNED IT OFF, TRIED RESETTING AND WOULD NOT RESET. DURING DESCENT, NR 1 BLEED VALVE DID RESET. BY 10,000 BOTH BLEED VALVES RESET AND WORKED NORMALLY. CHECKED PNEUMATIC CONTROL SYSTEM IN REF TO AMM 21-31-00-5-01. NO FAULTS WHEN BITE CHECKING EITHER PNEUMATIC SYSTEM CONTROLLER. ALSO, AFTER DOING CHECKS ON MAINT PANEL NO FAULTS WERE NOTED AND ALL SYSTEMS CHECKED AS WORKING NORMALLY.