02 nissan micra locking itself with or without ignition key inserted.

I have an 02 nissan micra I paid £100 pounds for it so its a bargain its marvelous but it has a self locking problem weather the ignition key is inserted or not, it self locks and if I operate the door open or the door close on the key whilst it is in the ignition the door locks do not respond whilst the key is in the ignition so I think this confirms that the key is not sending false commands to tell it to lock so I think the problem is either the central locking control module or one of the door acctuatters if damp is the problem it should be possible to take them apart dry them out seal them and then re install them. has anyone had expierience in dealing with this problem I do not want to spend a fortune on replacement acctuatters. your help and advice would be greatly appreciated.
 
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