What was found
AFTER TAKEOFF, RECEIVED GREEN HYDRAULIC LOW PRESSURE ON THE NR 1 GREEN PUMP. AUTO BRAKE FAILED AND A LANDING GEAR MESSAGE ILLUMINATED. THE GREEN HYDRAULIC SYSTEM INDICATOR BEGAN DECLINING. DECLARED AN EMERGENCY AND RETURNED FOR LANDING. THE GREEN HYDRAULIC DECREASED TO THE TOP OF THE YELLOW BAND. ONCE ON FINAL, AND GEAR DOWN THE GREEN HYDRAULIC SYSTEM LEVEL INCREASED TO BELOW THE TOP HAT. INSPECTED ACFT FOR HYD LEAKS, NO LEAKS FOUND. RAN BOTH ENGINES IAW JRH, NO FAULTS FOUND, NR 1 ENGINE GREEN PUMP OPS NORMAL AND NR 2 ENGINE GREEN PUMP OPS NORMAL. NO AUTO BRAKE OR LANDING GEAR FAULTS SHOWN. GREEN HYD SYS AT NORMAL LEVEL. MAINT PANEL SHOWS ALL OPEN FOR ALL ENGINE DRIVEN PUMPS, RAN BIT TEST OF BSCU, NO FAULTS FOUND IAW MM 32-42-00-05. ACFT OK FOR SERVICE.