depends on what you are after cos the file for the D version in the wabco docs is covering only the ABS part of it but the ECU is a special SLABS module developped only for D2 and it covers the SLS ass well
What codes does it throw up? If you want to try my diagnostic, by all means give us a shout. It may only be the Terrafirma one, but it'd be interesting to see what it sees on the ABS side.