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# 190702.
CUSTOMERS MAY COMMENT THAT THE SERVICE FOUR-WHEEL DRIVE / ALL-WHELL DRIVE INDICATOR ILLUMINATED OR THE FOUR-WHEEL DRIVE / ALL-WHEEL DRIVE IS INOPERATIVE. *TT