Now that my boat is laid up for the off-season, I want to get to some maintenance items. At the top of the list is cleaning the HE and after-coolers. It's time to replace the coolant anyway, so this seems like a good time to do it. I plan to bring the HE and aftercoolers to a radiator shop so they can pressure test and clean. I've never taken either off before, so I don't know exactly what I'm getting myself into. Do I need any special tools, or is there anything that I should be aware of? I'm hoping that it's self-explanatory and just nuts, bolts and hoses that need to be removed. Is there anything else I should be cleaning at the same time like the transmission oil cooler? Any and all advice is appreciated before I dive into this project. Thanks.