What was found
AIRCRAFT RETURNED TO PLATFORM DUE TO DURING RT ENG START, A FUEL LEAK WAS DETECTED. THE PLATFORM WAS CLEANED BY FIREMEN & MX PERFORMED REVISION, DETECTING FUEL LEAK IN THE MAIN FUEL PUMP DRAIN PORT. THE RT ENG WAS MOTORING, AFTER IT WAS STARTED & ENG OPERATIONAL TEST WAS PERFORMED IAW AMM 71-71-00, NO CONFIRMING FUEL LEAK, ALL CORRECT. AS A PRECAUTIONARY ACTION, THE ENG VENTS & DRAINS INSPECTION CHECK IAW AMM 71-71-00, NO CONFIRMING FUEL LEAK.