hi! i have a rattle that is coming from the trim area right above the pass side rear cargo window. If i push on the headliner right above that area it squeaks/rattles the same way as it does when i drive over bumps in the road etc. any ideas? looks like to get to the problem, the whole headliner has to come down. should warranty cover this? i have 21k miles on the truck.... or will they say it's a 12k mile thing???