I've just had a look at the owners manual and it mentions replacing the internal components of the brake master cylinder and changing brake fluid every 2 years and replacing the brake hoses every 4. Doesn't mention anything about changing caliper seals..
that seems crazy calling a brake caliper a 'non serviceable item'! especially on a bike designed for hard charging overland adventures..
I can't see too many people standing for having to replace a complete caliper at 209 quid, thats 600 odd quid for the complete set !!
Guess its a case of 'watch this space'.