X350 Compressor piston kit change - which tools required

[jinkster]

I'm in the Middle East with lack of tools. I have the kit to change the piston ring in the compressor. Which tools do I need in order to change it?

[judas]

Seem to remember needing nothing more than screwdrivers and a socket set (maybe some torx bits too to get the undertray and wheel arch liner off) when I did mine, but that was a while back.