Open truck, on the bottom of the rear window you will see rubber
running from one end to another.
This has come lose on me three times.
Its ok in the winter and will hold in place, however the summer heat will
loosen the glue and will come down. On mine its just one side, about a foot long.
You will know if yours has a problem because the trunk will have trouble locking.
The dealer has ordered the glue (special) and I'm waiting for
the call.