As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT FROM KPHL HYDRAULIC PRESSURE WENT TO ZERO, HYDRAULIC FLUID LEVEL TO STANDPIPE, THE CREW DECLARED EMERGENCY AND LANDED INTO KTOL WITHOUT INCIDENT. MAINTENANCE INSPECTED HYDRAULIC SYSTEM AND FOUND SLOT CONTROL VALVE LEAKING, MAINTENANCE REPLACED SLOT CONTROL VALVE AND SERVICED HYDRAULIC SYSTEM. OPERATIONAL CHECK GOOD IAW DACO DC-8 MM 27-80-4. AIRCRAFT RETURNED TO SERVICE. (B)