Kirok said:

Hi Sandaru, pretty simple job really. You need to drain out the gearbox fluid and then remove the oil pan. It's held on with about 20 small bolts. There's also a small pipe attachment at the front of the pan that needs to be unbolted, obvious when you have a look. Once you pull the pan off you'll see the oil filter attached to the bottom of the valve body with 3 bolts. Remove these and pull the filter away carefully. You'll notice some resistance as there is a rubber O ring gripping the filter feed pipe. You can replace the filter (it's a metal oblong shaped thing about the size of a pack of cigarettes). I wasn't able to get a replacement so I just washed it out in some petrol. The filter bit is just a fine metal mesh screen inside the filter housing.
When you fit it all back together be very careful not to get any dirt or grit inside the gearbox. You'll also need to carefully clean off all the original red gasket sealant and make sure none of that gets into the gearbox. I used a cork gasket and no liquid sealant when I did this job.
My recommendation however would be to just drain the old fluid and replace the external canister filter and don't bother with this exercise unless there's something worrying you about the way the gearbox is operating. An oil change (Nissan NS1 or the Fiat stuff) and new external filter will be adequate for a service. The danger of introducing dirt/grit/old sealant into the inner workings of the box is too high especially if you're working in less than ideal conditions, in my opinion. Good luck.

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