Mondeo won't unlock !!!!!

I have just bought a 1997 1.8 Mondeo and for the first week whenever i pushed the luggage compartment lock cylinder (with the car unlocked) You
would hear the lock solenoid clicking and you could then open the boot. This has stopped doing this and you now need to use the key to open it.Do i have a fault here or have i done something to disable this with the central locking. Any help would be appreciated.
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