I've got it also.
Mine was built in August.
I thought it was part of the break-in cycle.
It was bugging me so much I made an appointment today (2 weeks out) without reading this forum.
The guy looked up my VIN and NO TSB for mine.
He stated that fact with an intonation like "we cant help you unless there is a TSB on your VIN."
Going to make a few phonecalls tomorrow to customer service line.
I love the truck otherwise.
On a positive note, my dealer sent me a loaf of bread by mail. Nice touch
, or a bad cliche
if this goes poorly.