jimbo, could be one of the front tyres has blistered on the inner wall, i went through lots of p zeros before i gave up on them, the blister is not always easy to spot as it may be bulging inwards to the rim. suggest trip to any tyre place to remove tyre and inspect.
the blister can cause vibration and a noise. worth a check me thinks, especially as your dealer has not spotted anything wrong with the car.
the blister can cause vibration and a noise. worth a check me thinks, especially as your dealer has not spotted anything wrong with the car.