You need to look up the EASA AD.
The URL I gave to the SB569A contains a list of serial numbers. Basically any of the bigger engines, 1997-2002, is affected.
An engine rebuild is the bigger part of £20k but I would never do it in Europe. Too many engine shops here are simply incompetent. I would use a highly respected U.S. engine shop; did this a year ago using
this firm and it cost $12k plus shipping.
The most expensive (but totally reliable) way to ship would be DHL which would come to around £1500 each way for a 250kg engine in a crate, 3 days each way. Air freight can be a lot cheaper but is much more hit and miss time-wise; could take 4 weeks each way if they mess up.
I know a man who paid £20k to the now-defunct CSE for an IO-540.