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-336.
Rear Fascia Gap
Condition
Some customers may comment that the rear fascia is sticking out near the tail lamp
Cause This may be due to the stud not being centered in the hole of the impact beam mounting
plate.
Correction Loosen nuts to the impact beam and re-adjust using the procedure outlined below.