mejeric, to remove the centre vents is quiet easy.
You need to put a little masking tape around the gap between the vent and the dash. This is to stop damaging the dash pannel.
Then get a sturdy flat headed screw driver, and with a bit of patience; thread the screwdriver alomng the vents carefully prizing around the edges, eventually it will come out, dont be too scared the vent is fairly robust.
I have now located the screens main cable. There is a plastic cover under the radio, about 10" long, you unclip this and the loom/cable is accessible there.
I will eventually do a digrammed write-up on this once I have retified my issue.