Mine might have expired after 2000 miles too but this looks like a valve will have caused the damage (if there is damage yet to check). I however was running 1.5 bar but it was no where near as hard mapping as the likes of Jools (custardcupra) as his with the P20 still spooled well mine always felt laggy.
As soon as I've stripped mine down there will be a 'looks whats failed' thread to warn people, and I really wished I'd seen Bill's thread regarding fitting a £375.00 set of one piece valves before going IHI. When I spoke to Jabba regarding internals I was told not to worry or waste my money, and there would be no problems on the standard valves... oops.
If my VF34 P20 is dead I'll be looking into the likes of the above mentioned, but untill I actually know whats wrong I can't comment too much. Need to find out what is wrong before throwing away £££.
I'm undecided on mapping, if Mike will map another turbo fair play, if not I'll need to find somewhere willing to do it.