Sorry, the NHTSA has not posted this TSB document yet.
You can still get the detailed info from Volkswagen for this TSB. Call your local Volkswagen dealer's service department & ask for a copy of TSB# 2015831.
Affected Component: STRUCTURE:FRAME AND MEMBERS:UNDERBODY SHIELDS
VOLKSWAGEN: EXHAUST HEAT SHIELD, REPLACEMENT GUIDELINES. HEAT SHIELDS ARE TO BE INSPECTED AFTER COMPLETION O ANY TYPE OF REPAIR TO THE UNDERBODY (EXHAUST SYSTEM TRANSMISSION, ETC.), AND IF DAMAGED, REPLACED. *PE