If the vibration is coming from the large black wind-up sunroof fitted above the cab on your Bolero it was a well talked about problem with new motorhomes back in 2017. Swift shortly after carried out a mod to a number of new motorhomes around that time. Our new Swift motorhome back then had the same problem and it was corrected by Swift when it was returned to the factory by the dealer for other issues including that. I think they fitted a new larger seal around the sunroof and that cured the problem. The vibration did not happen all of the time but when the wind was in a certain direction and when travelling at a certain speed. The post at the link below on here talks about the same problem.
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