Too small for me to read the code on the bearings, XM1501 wheels so 240 CL 142 hubs, need to change the freehub bearings, far too many variants listed on the DT site and most info seem to just list the hub bearings.

You need to read them as there is more than one freehub design.

I’d contact DT Swiss through one of the social channels. I’ve not touched mine in 4 years and seem fine – which probably means they need some love.

I think you want the 6802 (15/24×5) ones, see here in description. Also Bike24 has a list that might help.

The codes for these are:
HSBXXX00N1244S = standard
HSBXXX00N1466S = stainless

From my research if you want the stainless it’s cheaper to buy a new freehub!

Thanks.