I have a problem with the central locking on my 2003 (L322)RR Vogue. It all works as it should apart from the driver’s door not unlockingwith key fob. When the key is pressed I can hear a “clunk” noise in the door.The driver's door can be opened by inserting the key into the lock. If usingthe dashboard locking button, all doors lock and unlock apart from the driver'sdoor. I think I can deal with dismantling the door myself but need to know inadvance which replacement parts to buy. Your help and advice would be muchappreciated please.