I've put my vr in for an MOT and the ABS light was on the garage have run a diagnostic on it(£40 just to plug a pc in but that's a different matter) and it is coming up saying "signal outside of tolerances" from my ABS pump they have checked the connections and they are in mint condition but they are not sure what it is as not an official vw garage but they think that the pump needs to be replaced at a cost of approx.£500. Can anyone shed any light on this or tell me somewhere to source a new/used pump at a minimum cost? cheers in advance