there is a post about re-packing them somewhere, as the shocks should be ok just the grease has gone hard? over on general discussion on the uk sidc bit.
I think that is is not on thats all, i was going to buy the warranty when mine runs out in july but what is the point as the blistien ones on the rb320s are even more expensive so 1100 for an extra 2 years warranty is not that bad a deal for piece of mind but if they are not covered pointless.