OK, so none of the lights worked on your grey 071 with a similar decoder? The first MM sound decoder I bought was DOA (dead on arrival), no drive, no lights, no sound, but the dealer replaced it no problem and it ran fine. FYI, I use Lenz (10321) 4 function decoders on my non-sound 071s because I don't care for the cab lights and they are good value at €25 in Germany for a top brand decoder.