S-Type 2.7D A/C compressor replacement

HI All, Good to be on here.
I have a 2005 2.7D with a worn out A/C compressor so I have 2 questions-

  1. Has anyone replaced the Compressor?
  2. Has anyone done the Compressor valve spring mod in situ?

Not on a 2.7D.
Did replace the Air Conditioning compressor on a 2001 4.0L Petrol, LH drive. Very easy job.
What is the Compressor valve spring mod ? I’ve not heard of it.
Best Regards.
Richard Cielec
Greater Chicago Metro; U.S.A.