Not actually tried it yet myself, but I understand it isnt too tricky...that said, I will probably ship mine to Justbackdated to service at the same time.
Its worth having a chat with him, he should be able to supply the springs, and he will certainly be able to top notch service your fork.
He took a pair of very scruffy 36's I found on the bay and made them virtually like new for me.... he is a pace god!