What was found
(CAN) DURING FLIGHT 1 HYDRAULIC PUMP LIGHT ILLUMINATED INDICATING LOW HYDRAULIC FLUID LEVEL. THE LANDING GEAR WAS EXTENDED NORMALLY AND THE AIRCRAFT RETURNED TO THE AIRPORT FOR A NORMAL LANDING. DURING INVESTIGATION THE MAINTENANCE CREW FOUND A HYDRAULIC LEAK IN THE RT FLOAT MLG. THE O-RING WAS REPLACED AND A GEAR RETRACTIONTEST WAS COMPLETED. THE AIRCRAFT WAS RETURNED TO SERVICE.