What was found
CREW REPORT, HYD GREEN ENG 1 PUMP LO PSI WITH HYD GREEN RSVR LO LEVEL. FLIGHT CREW SHUTDOWN GREEN SYS BEFORE QTY EMPTIED IAW QRH. SERVICED GREEN HYD SYS & CHECKED FOR HYD LEAKS. PERFORMED FLIGHT CONTROL CHECK, NO LEAKS NOTED. NO LEAKS NOTED ON ACFT ON FUSELAGE OR WINGS. SUSPECT AIR IN SYS. RAN NR 1 ENG & OPERATIONS CHECKED FLIGHT CONTROL SYS, NO LEAKS NOTED, GREEN HYD QTY HAD NO CHANGE.