What was found
ENROUT, CREW NOTICED "A" SYS HYD FAILURE. CREW FOLLOWED AFM EMERGENCY PROCEDURES AND DIVERTED. DECLARED EMERGENCY AND LANDED WITHOUT INCIDENT. SYS WAS TROUBLESHOT TO A LT ENGINE HYD PUMP FAILURE. REPLACED LT ENGINE HYD PUMP, CASE DRAIN FILTER, PRESSURE FILTER AND RETURN FILTER. HYD SYS WAS FLUSHED. SYSTEM OPS AND LEAK CHECKS WERE GOOD. ACFT WAS RETURNED TO SERVICE.