What was found
(CAN) PRE-TAKE OFF CHECKS WERE COMPLETED FOR FLIGHT. AC WAS TURNED INTO WIND AND TAXIED FORWARD TO STRAIGHTEN OUT NOSE WHEEL. ONCE DONE THE TOE BRAKES WERE APPLIED BY THE COPILOT AND THE PILOT BECAUSE THE AC WAS ROLLING FORWARD. IMMEDIATELY, FLOATS WERE ACTIVATED. NEITHER PILOT RECALLS PRESSING FLOAT ACTIVATION BUTTON ON EITHER CYCLIC. AC WAS THEN FLOWN WITH THE FLOATS ( ALL FOUR ) DEPLOYED. THE FLOATS WERE DEFLATED AND REMOVED FROM THE AIRCRAFT. THE FLOAT SYSTEM (4 FLOAT BAGS, 4 FLOAT BOTTLES AND 4 SQUIBS ) WERE REMOVED FROM ANOTHER AIRCRAFT AND INSTALLED ONTO THIS AIRCRAFT IAW THE MM. A WIRING CONTINUITY CHECK OF ENTIRE FLOAT SYS WAS PERFORMED AN NO FAULT WAS FOUND. THE AIRCRAFT WAS RETURNED TO SERVICE.