this info was released on the launch of the 339
as you all wel know OP never communicates via forums, so with the exeption that every 339 falls apart in a few days from now my feeling says we're not gonna hear
a lot of OP (like usual) and like i mentioned before just have a look at page 4 of your manual which declines about every responsability they could face, let's be honnest
you can all just 'hope' your (and mine) little treasure doesn't disintegrate laying in your safe cause that's probably for now the best place to keep it
oh and by the way the discoloration happens with mine also, strangely it comes and goes, if i clean the back with pure water it becomes like greyish brown after a few days
of wear it has the same color again as the rest of the case, call it a "magic back" wonder what would happpen if i throw it in glass of beer, maybe it will disapear hahahaha