Sorry, the NHTSA has not posted this TSB document yet.
You can still get the detailed info from Mitsubishi for this TSB. Call your local Mitsubishi dealer's service department & ask for a copy of TSB# 7913.
CUSTOMERS MAY REPORT THAT AFTER PUSHING THE HORN BUTTON WHEN THE ACCESSORY SOCKET IS IN USE,THE HORN CONTINUES TO BLOW WHEN THE BUTTON IS RELEASED. *TT