Do a search on TAPE MARKS. There are quite a few topics on it.
Here's one:
http://www.ptcruiserlinks.com/forum/...s=t ape,marks
I had them on mine... but I also had a VERY good dealership. They repainted the bumpers for me no problem. Also replaced my peeling chrome wheels with Mopar ones. So check your wheels, too... lol!
The adhesive in the tape has reacted with the uv protectant in the bumper. The more exposure to sunlight, the lighter it becomes. Helps to understand why some are affected sooner than others.
Hopefully you have a dealership you can deal with, and will help you out. I really lucked out on my original dealership in Niagara Falls, NY... and found an awesome dealership here in Coon Rapids, MN.