We had the front panel replaced on our Bailey Ranger 2 years ago. It was 1 year old at the time - the crack was found by the dealer at its first service.
Other threads on this forum seem to suggest that it was a faulty batch of panels used at the time and that the problem has now been sorted.
I would definately insist on a replacement rather than a repair. Bailey were very good in sorting the problem out in our case - the van was returned to the factory to have the work done and back with us in a couple of weeks.
Is the dealer insisting on the repair? If so I would contact Bailey direct.
Regards, Martin.