Just picked up my High up from its 2nd service, software upgrade done, (is it only for the fuel gauge?). So, dealer rings up just before I pick up to say I've got a slow puncture on one of my front tyres which incidentally "has only 3.5mm of tread left" and should they change it for only £86.I posted on here, just the other week about having 4mm tread left so knew they were wrong and thought it really unlucky to get a puncture that "couldn't be repaired" on the way to the dealers.( I checked the pressures before it went in and didn't notice any loss). Said I would sort it and took the wheel off today, no sign of any holes or damage and not loosing any pressure I can see. Is there anything else I should check before I go back to the dealer and kick off?