while you are at it look at the rotors and caps the are on the front of the engine, green corrosion is a sign of impending doom. Mine were replaced at 70k, the car would strart and sometimes would barely move, it seems the computer sees something and retarts the throttle.
P.S. The rotors and caps are expensive !
I loosend the lower hose, and drained, just did not feel comfortable twisting a plug, it will give you the oppurtunity to feel the hoses for ?