I pulled the hydro to clean and inspect.Yes it needs a good degreasing.The valves are free,no leaks,should I do anything to them?The cooling fan is aluminum, no broken blades.But even tho it has two set screws holding it on,it unusually turns with some sort of friction connection.Explain that please!The coiled spring goes thru a coupling arm,it has a bit of slop.Should I replace the arm,pin or shaft or leave it?What should you look for while inspecting the flex disc?Lastly what is the purpose of the air baffle plate?Thanks guys,I just want to get it right.