I’m looking at buying a very nice X308 Daimler Super 8 but after running through some initial tests, I found that the airflow appears to be stuck at the 4 face level vents. The lights on the switches for the demist, foot and foot/demist options all turn red when pushed but the flow doesn’t change. Also there is no audible sound from behind the dash when activating the switches. Is this an easy diy fix or should I be asking for a number of $’000’s off the asking price and take it to a jag specialist?. I’m after some advise please.