i have removed the metal under tray to try and trace a water leak that i have(4.4), it seems ok all the time i am driving but if i have been on a longish journey then park up i have have a small wet patch left on the drive, i have removed the plastic panel where the pollen filter is and the bulk head panel, i can't see anything but i have been reading about the valley pan, this could be the problem but how else can i check it, my local garage couldn't find it, car is a 2003 with 61000 miles, any help would be great.