Has anybody had a problem with corrosion just under the lip of the tailgate? Around the small rectangular reflecter. I've just taken my '06 roadster into the deaers to see if they'll fix it under the corrosion warranty and they'll have to send pictures of to see if Fiat will honour the warranty. If not it's going to cost me around £1500 for a new tailgate! Any suggestions or comments would be welcome! Thanks