What was found
HYD SYS A AND B BOTH LOST QTY DURING FLT ABOUT 1PERCNT EVERY 10 MIN FLIGHT CREW LOGGED QUANTIES AND TIMES CREW ALSO INDICATED PRESSURE ON BOTH SYSEMS WERE CONSISTANT AND NORMAL. INFO: CDS BITE SHOWED NO ASSOCIATED FAULTS FOUND RSERVOIR FILL SELECTOR VALVE ON THE B SYSTEM POSITION. MOVED SELECTOR TO THE CLOSED POSITION. PERFORMED DEU 1 & 2 SELF TEST PROCEDURE. PERFORMED DEU 1 & 2 BITE TEST. NO FAULTS PRESENT AT THIS TIME. BOTH DEU 1 & 2 TEST PASSED. PERFORMED HYD RESERVOIR PRESSURIZATION SYSTEM LEAKAGE TEST. TEST PASSED. PERFORMED EXTERIOR WALK AROUND TO CHECK FOR LEAKS. NO LEAKS NOTED AT THIS TIME. FOUND RESERVOIR FILL SELECTOR VALVE ON THE B SYSTEM POSITION. MOVED SELECTOR TO THE CLOSED POSITION. PERFORMED A 5 MINUTE ENGINE RUN 1 & 2 ENGINES, NO FAULTS NOTED AT THIS TIME. RAN HYDRAULIC SYSTEMS A & B, CYCLED FLIGHT.