Sorry for the delay, but I was completely snowed under with work (and I am self-employed, so can't turn it away !!)
Pictures now as promised. I have "re-fixed" mine this morning because the dealer fix started to fail. It took 10 minutes and a test run has verified this has worked.
Step 1 (pic 1) - remove the rubber seal like so and keep in a safe place.
Step 2 (pic 2) - unscrew the black screws holding the centre trim piece in place - there are two, one at each end.
Step 3 (pic 3) - ease out the centre trim piece. You will see two arms (one at either side again) and you will also see where the top trim has a ramp pointing down that meets the centre trim piece when it is in place. It is this contact that makes the noise. You will see on my picture on the ramp pointing down the teflon tape that the dealer used and how this is starting to come loose. I have gone the other way and covered the arms of the centre trim piece with sticky-back felt.
Step 4 - push the centre piece back in, screw in place and replace the rubber seal.
Step 5 - enjoy the creak free ride
