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I had this happen on my Mazda once. The mechanism had gone a bit stiff and the solenoid wasn't strong enough to move it properly.
I manually dragged the locking button up and down a few dozen times in quick succession and that seemed to sort it. The fault never came back.
Maybe this won't sort your problem, but it has to be worth a try before you start pulling things to bits.
Currently in Horatio's garage:
2010 Laguna III Initiale.