Hi there, I've got a slow leak in my front 2 S3 tyres. Loosing about 5/6 PSI a week. I've had the tyres looked at in the local Kwik-Fit and they can see bubbles coming off of the rim where the tyre joins the wheel. They've suggested I need to get my alloys refurb'd (?), but this is on the inside of the wheel and in the rim. Anyone have an idea what I need to do to fix this ? I've never had this type of leak in a tyre before. Thanks, Roy.