I couldn't find any photos on the forum regarding this switch, so here's what I did on my 850.
Remove the gear lever.
Remove the four bolts securing the primary transmission cover.
then you are faced with this...

You can see the switch in the dark recesses, held in with 2 cross head screws.
Remove the screws and it pops out...

Clean up the contacts with whatever you have handy. I used electrical cleaner/degreaser and a fine brass wire brush. In the photo you can see a ring where the contact pin has worn the switch over the years but it's still good.
When reinstalling check that the contact pin is still in place or nothing will work. Ask me how I know

You can pull the pin and clean that too while you're in there, I used a pair of needle pliers to remove and replace. Watch for the spring behind it too.
*Handy Tip* The second time I went in, I put a piece of 3/4 inch wood under one side of the centre stand to stop that small drip of oil.
So, now it's all good again and no more annoying niggly missing 3rd gear.
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