Help - we’ve owned a 19 reg Vantage Neo motorhome since May. It’s a comfortmatic transmission. Occasionally when driving we get a strange ‘bong b-bong’ sound emananating from the dash. It doesn’t occur with any regularity and since we’ve owned it it probably has only sounded a dozen times. The performance of the vehicle isn’t affected. Neither Fiat nor Vantage can offer any help. Any clues anybody???