Hi. Just bought a 07 TBSS and have noticed there are small cracks all over the clear composite headlight plastic lenses. GM has a technical bulletin on this but the dealership said they won't replace them under the certified GM warranty. Something about being caused by extreme heat or chemicals on the plastic. I was wondering if anyone else has had this problem and has found a solution. I don't know if I should keep pressing the dealership to replace them. Thanks.