What was found
(CAN) ON APPROACH THE CREW RECEIVED A HYD PRESS INDICATION ADVISORY WHEN THE LG WAS SELECTED. IAW CHECKLIST, THE LG WAS EXTENDED USING THE ALTERNATE SYS & ALL 3 GEAR INDICATED DOWN & LOCKED. THE ACFT HYD PRESS & QTY WAS VERIFIED & THE ACFT LANDED WITHOUT INCIDENT. AN INSPECTION OF THE ACFT WAS COMPLETED & IT WAS DETERMINED THAT THE PRESS FAULT WAS CAUSED BY AN INTERMITTENT HYD PUMP OPERATION. THE HYD PUMP WAS REPLACED & ALL HYD RELATED SYSTEMS WERE VERIFIED FOR FULL OPERATION & INDICATION IAW THE MM. THE ACFT WAS RELEASED BACK INTO SERVICE.