What was found
(CAN) ON CLIMB-OUT, THE NR 2 HYD PUMP CAUTION LIGHT ILLUMINATED. THE POWER TRANSFER UNIT AUTO STARTED. HYDRAULIC QUANTITY AND PRESSURE IN THE NR 2 SYSTEM WAS NORMAL. THE QRH CHECKLIST WAS ACTIONED. A "PAN PAN" CALL WAS MADE AND THE AIRCRAFT RETURNED FOR A NORMAL LANDING. DURING THE APPROACH TO LAND, THE CAUTION LIGHT CLEARED (POSSIBLY AS A RESULT OF THE HYD PUMP COOLING)." "LINE MAINTENANCE INVESTIGATION IDENTIFIED THAT THE EDP (ENGINE DRIVEN PUMP) HAD BEEN RUNNING EXCESSIVELY `HOT`. PUMP REPLACED WITH A SERVICEABLE UNIT. FOLLOWING APPROPRIATE CHECKS IN ACCORDANCE WITH THE AIRCRAFT`S MAINTENANCE MANUAL THE AIRCRAFT WAS RETURNED TO SERVICE WITHOUT FURTHER INCIDENT.