What was found
DURING CLIMB, THE NR 1 HYD SYS FLUID QTY DEPLETED AND THE NR 1 ENG HYD PUMP CAUTION LIGHT ILLUMINATED SHORTLY AFTER. AS IT WAS A SHORT FLIGHT, CREW ELECTED TO CONTINUE, DECLARED AN EMERGENCY INBOUND AND LANDED WITHOUT FURTHER INCIDENT. A VISUAL INSP OF THE ACFT REVEALED TRACE OF HYD FLUID AT THE TAIL SECTION. MX FOUND A CRACKED UNION FITTING, PN AN815-6D, ON THE RUDDER DUAL PRESSURE REGULATOR VALVE WHERE THE NR 1 HYD SYS PRESSURE SUPPLY LINE CONNECTS. THE FITTING WAS REPLACED, THE NR 1 SYS REPLENISHED/BLEEDED AND THE VALVE LEAK CHECKED. THE NR 1 ENG DRIVEN PUMP WAS INSPECTED IAW AMM 05-50-33 AND FOUND SERVICEABLE. THE ACFT WAS RELEASED AND RETURNED INTO SERVICE.