I have just bought a Ford Galaxy 1996 2.0 TDi. The driver door doesn't want to remain completely shut. When closing, it returns to that half-locked/open state (ie not open but also not closed completely). Trying a number of times eventually works, but I would like to fix it. Any ideas? The other doors are fine, just this driver-side door giving trouble. I've tried closing it softly, which increases the success-rate, but still not ideal (ie 100%). Opening the window (in case it's a pressure thing) also doesn't help. Any help appreciated.