Sorry, the NHTSA has not posted this TSB document yet.
You can still get the detailed info from Mercedes-Benz for this TSB. Call your local Mercedes-Benz dealer's service department & ask for a copy of TSB# SB-91-40-192.
MERCEDES: REPLACING THE EMERGENCY TENSIONING RETRACTOR. WHEN REPLACING THE LEFT FRONT REVERSIBLE EMERGENCY TENSIONING RETRACTOR (A76) OR THE RIGHT FRONT REVERSIBLE EMERGENCY TENSIONING RETRACTOR (A76/1), RETURN THE DAMAGED PART TO THE QEC WITH THE WARRANTY PARTS RETURN SLIP AND WITH THE QUICK TEST REPORT. *PE