Wanted P99-X30 Wiring Diagram (Steering Wheel Audio Control Interface)

Does anyone have a PDF of the AudioLeads.co.uk P99-X30 Adaptor, I am in the middle of taking out a radio from a Discovery 2 that I have just been given that has been really bodged and as far from neat as you could get, I just need to know what the White, Black and Red leads from the unit are for.

I know that they are cheap, but as I have this unit here and I can clean up this mess so long as I know what these leads are for.

Any help would e much appreciated.

James