The Omega I purchased a couple of weeks ago (1998 Estate) has developed a rather annoying fault in that the front passenger door lock doesn't function properly. This started as a sometimes it would, sometimes it wouldn't kinda thing and got progressively worse until today I can't unlock that door at all - I can't even lift the button up from inside. Is this a known problem and are there any suggestions as to what might be the cause? If it's simple/cheap to rectify then I'd rather do it myself than loose the car for a couple of days by taking it back to the garage I bought it from. Any insights would be appreciated. Regards Steve G