hi i run a 2002 double cab which is due for test next month,i have noticed the rear area surrounding the back seat belt brackets under wheel arch have a bit of corrosion and after a bit of cleaning one or two smallish holes have appeared which go thro into cab.anyone have a idea how to fix this and will it effect test. i could just fill with waxoil underbody but want to keep this truck for as long as poss,any ideas appreciated...