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# 08232004.
THE PASSENGER SIDE REAR SAFETY BELT MAY HAVE BEEN INSTALLED WITH AN INCORRECT NUT AND BOLT. NON-COMPLIANCE RECALL 04056. GM ADMINISTRATIVE MESSAGE. *TT