02 envoy 4.2 6l slt has a leak in the transmission line on the passenger side of engine. The line leaking is the lower line. I can't find the part number for replacement nor have I found whether I have to replace both lines as a single unit. I believe it's the inlet outlet lines from under the radiator to the transmission. Questions are, how much of the line needs replacing, the leak is at the lowest point on the line beside the transmission, does anyone know the part number or numbers required to fix, are there any special tools to get repair done and does anyone know where I can find the transmission cooling schematics for my vehicle?