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# 04192004.
AS A RESULT OF A RECENT CHANGE IN THE HEADLAMP REFLECTOR, IT IS NOW POSSIBLE TO ELIMINATE THE HEADLAMP BULB SHIELD ON THE LOW BEAM BULB OF THE HEADLAMP ASSEMBLY WITHOUT ANY NOTICEABLE CHANGE IN LIGHTING PERFORMANCE. GM VOICEMAIL EXPRESS. *TT
