has anyone with a 2004. 5 heard anything about leaking freeze plugs on the blocks?My dealer on last oil change showed me a bulletin from DC to check the block for leaks on the plugs. They hold the engine at max power for 3 minutes to do the check. we have a 2500(was checked no leaks)also a 2004. 5 3500. Is this check to be done on all 2004. 5 engines?