Bit late to the party here, but the plastic cap on the end of the compressor where the air pipes come out have been known to crack between the pipes. I had this on my D3 and diagnosed it by spraying it soapy water and watching for bubbles. I bought an aluminium one off ebay for about £35 and fitted it on the driveway in about half an hour. I guess because it hadn't been overheating for too long the compressor itself wasn't goosed and I got away with it.
Have a look here
https://www.disco3.co.uk/forum/suspension-...%2Bleaking
Can't recall if I got it from here, but similar (also do them for Dunlop compressor)
https://www.ebay.co.uk/p/for-Land-Rover-Di...0005.m1851

you can always disconnect the thick wires to the compressor and see if the fuse no longer blows

Howler... I’ve used these before for a compressor and it is the exact make and fit. I think LR use this make now

If your has the old style hitachi fitted, you will need to buy the upgrade kit (connectors etc) to have this fitted but that’s what LR dealers have to do also.

Make sure it will be for your year car... best speak to them before purchase for confirmation.

https://www.jgs4x4.co.uk/land-rover-range-...-lr078650/

Hope this helps save you a few shillings
UK Guy RRS HSE with a few extras & a
2013 RRS Autobiography

Update!

Well I've had her in to the indy 4x4 garage (the car not the wife ) and had the compressor changed it was completely foobared!

The total cost was £1092.02

Ill start a new topic with the advisory's they have listed soon.

Many thanks for the help and advice