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[Grim]

I did post this before but have had little help. does anyone know how to start solving this problem?
I have just purchased a tidy 1999 X plate focus there are a few bits and bobs needing done but the main is the central locking.
I can lock my two front doors with fob, unlock only the drivers with the fob and open the passengers door with the key (won't open from inside.)
The two back only work manually. Boot is fine
I took the door card off the passenger door had a look stuck it back on and it worked properly for three times and went again.
Maybe I have a broken door catch/cable. But why would the rear doors not work?
Any help would be much appreciated :-D