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# 040844004.
POP NOISE HEARD FROM REAR SPEAKERS WHEN REAR SEAT AUDIO (RSA) IS TURNED ON OR OFF (NO FIX AT TIME, FIX UNDER DEVELOPMENT). *MJ THIS SERVICE BULLETIN REPLACES 040844004. *EH