Donniemac

Hey guys. Sorry first time posting on here. I have a Milwaukee m18 fuel 1/2 drive impact gun. Year and a half old and it's gone faulty . Totally forgot to register it online for the extended warranty so need to try repair it. gun won't work atall even with different batteries. When the trigger is pulled the led work light in the front flashes three times then pauses then flashes three times and so on. Is this a flash code and does anyone ever heard of this??? cheers and thank you