The window wound down but then wouldn't wind up. Removed door card etc. Window motor is running the cable OK but lots of clanking noises as the cable gets to a certain position.Window is running in the guides OK. Green support fitting at the bottom of the window looks OK but problem seems to be with the cable going through the top fitting (found a bit of this at the bottom of the door). I can't see how to access this fitting. Any ideas please?