There isn't a drain port, and its very messy to do. I would suggest the simplest way is to suck the reservoir dry of fluid (remove and clean the filter while you're at it) and just top up with fresh. There is a relatively small amount in the rack and pump so a tank full of fresh fluid is close enough for DIY.
If you really want to completely flush it then I can jot down some thoughts later. Be prepared to have green oil everywhere though.
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