Just did a little bit of research about this. Like you've encountered it can be related to oil in the ECU. From what I've read and gathered it is relating to communication between transmission and ECU. Paul (off track) will have a lot more info on this but it seems the M&S Lights can be a variety of things (but not as bad as the amigos). It actually happened on mine tonight (has happened before but a restart seemed to fix it but hung around longer today). Common threads are relating to;
Air-con drain (water getting into harness I believe)
Oil in ECU from the red plug
Battery voltage
Even outside temperature has been thrown up a few times. Heat=more common.
I believe there is more but from my limited experience it could be a whole matter of things. As always; work from easiest/cheapest->hardest.


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A disco owner and able to snare a mechanic to work on it into the bargain! 
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