While removing the ABS module I discovered a sensor attached to what looks like a refrigerant line had a puddle of green liquid in it, not sure if it is refrigerant w/ fluorescent dye or old green coolant.

Kind of doubt it's old coolant as it was all flushed & filled with orange a couple weeks ago & surely this heat would've evaporated that by now. Below is pic, any input is appreciated.

 

As I advised in the "What have you done..." thread, it's your Air Conditioning Pressure switch. Very easy to replace, just undo it with a spanner and screw on a new or replacement one. Undoing it won't release any gas or liquid, and it's only a light torque putting it back. Jaguar sell new ones for £60 but I got a replacement from a scrapper for £5.