I've found the 'servo' dip-stick I think you are referring to. It is for the power steering 'oil' of course....d'oh!

Anyway I've checked the dip stick and it IS below 'max', so I will try to get some MB power steering fluid and top up tomorrow.

I've also located what I think is the tranny fluid dip-stick and it has a cap with a red band in it and says 'MB service use only' or something like that.

I am now a bit more knowledgeable about my car.

Thank you very much.