What was found
INFLIGHT WE RECIEVED THE HYD VOLUME LOW A AMBER CAS ALONG WITH THE SPOILER FAIL OBD AMBER CAS. THE HYDRAULICS SYSTEM A WAS INDICATING 14% AND REMAINED LEVEL THROUGHOUT THE REST OF THE FLIGHT. THE OUTBOARD LEFT AND RIGHT SPOILERS WERE IN THE UP POSITION AFTER SHUTDOWN. PERFORM VISUAL CHECKS OF SYS A HYDRAULIC SYS. FOUND LEAK AT B-NUT OF RETURN LINE OF BRAKE CONTROL VALVE LINE. RE-TORQUE LINE & WAITING ON HYD FLUID TO SERVICE UNIT. DUE TO AIRCRAFT REPORTING EMERGENCY LANDING, ACFT IS UNABLE TO FLY UNTIL LOG ENTRY. SERVICED HYDS. IAW AMM 12-10-45. RAN ENGINES OPS BRAKES & FLT CONTROLS IAW 27-00-00 AND 32-00-00.