central locking prob

[Richy325iTouring]

My central locking has gone tits up.

It was working fine then it went a bit mad had a locked actuator, changed that and it worked fine.
Then one day t stoped working Could hear this strange noise form the wing as i operated the lock so thought that its the control module. Changed that today and still nothing. Could it be the actuatar in the door again or the solinoied. Im lost for ideas now but it wont work off anydoor now and its really buging me.

Thanks Richy