There have been around 10 airframes reaching the 2000 hour overhaul (3 in Russia plus one crashing at 1995 hours, 2 in Nigeria and the remainder around the world).
The average engine 2000 hour PMI is $95,000 which includes the stage 1 and 2 wheel replacement. For the 4000 hour, you will need to factor in the stage 3 and 4 wheel replacement at $31,000 plus some additional wear and tear, the engine should be around $145,000 for the 4000 hour PMI.