Fill in the form here:
https://www.jungleproducts.co.uk/warranty/returns/santacruz/
…and include proof of purchase. A complete set of bearings arrive a couple of days later. Never had to answer any questions about whether they need doing – I guess if you’re asking every month, they’ll probably ask a few more questions!
The bearing warranty does not include labour, so either you’ll need to pay an LBS to do it, or learn to do it yourself (it’s a surprisingly easy job to do – just make sure you have a kettle of boiling water to hand!)
My TB2 CC is on it’s 3rd full set – the uppers last about one year, the lowers at least two (they have grease ports which really helps the longevity). Takes me an hour or so to do uppers and lowers – longer if I’m cleaning it up as I go. I now do it routinely as part of the Spring service, so the bike is in bits anyway.