Sorry, the NHTSA has not posted this TSB document yet.
You can still get the detailed info from Chevrolet for this TSB. Call your local Chevrolet dealer's service department & ask for a copy of TSB# 17-NA-259.
Body Creak Noise from Rear Seat Area
Condition
Some customers may comment on a creak or "itch" type noise from the rear seat area. The noise may be heard during acceleration, braking or when a twist or load is applied to the vehicle
Cause: The noise may be caused by either metal contact between two panels or an insufficient bond between the panels.
Correction: Spot weld and/or modify two body panels to correct the condition by following the Service
Procedure below.