Let me know if you find a quicker way to replace it, because I may end up replacing mine agaiin due to some oily stuff in the coolant reservoir. At the moment, I think it's transmission cooling line fluid running through the radiator that's leaking into the coolant. Maybe there's a crack internally. There doesn't seem to be much fluid in the reservoir, and all other fluids are clean and levels appear normal. Will keep monitoring for now...
EDIT: Actually, I'm going to eliminate the transmission as the source of the problem by removing both tranny cooling lines and joining them with a barbed union for a few days, bypassing the radiator altogether. Over a few days, any remaining oiliness should vanish. And, if it ends up being the radiator, I believe the warranty from Autozone on that part is either three or five years, so it will be covered.