My 1998 micra has done 100K and is probably due for a change of gearbox oil.  The Haynes manual tells you how to check and top-up the oil (through the speedometer cable hole!) but not how to drain and replace it. 
 
There seem to be two plugs on the front of the gearbox.  Am I correct in thinking that the bottom one is for draining and the top one is for filling? 
 
{year added to header, as per the IGNORED request to do so!}
                            
                                Edited by Dynamic Dave on 24/01/2008 at 10:12
                             
                            
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