ive gone through my owners manual and watched some videos but dont know if i need to unscrew these two plugs. they say water drain on them but i broke a wrench trying o unscrew the one and it doesnt look like its ever been removed. it looks me me like my manual says to unscrew them but the videos ive watched they dont but its a different boat. so do i need to remove them. its a plug on both sides of the v drive.