Completely understand the shock at the cost - but it is a well-documented cost of running the V12's. It's their equivalent of the Active Body Control or Roof leak issues on the SL500. But the good news is that there are plenty of refurbished units around, and Specialists know exactly how to do the awkward replacement.
The nice thing about doing this kind of maintenance is you realise just how well these things are designed and built.
We've come a long way since the fabulous, in their own time, Jaguar V12's
Dont want to upset the thread but pretty sure thats a either a 3.2 or 4.0 straight six jag lump