Sorry, the NHTSA has not posted this TSB document yet.
You can still get the detailed info from Porsche for this TSB. Call your local Porsche dealer's service department & ask for a copy of TSB# TI-59-09-2.
PORSCHE: WORKSHOP CAMPAIGN WA19-REPROGRAMMING DME AND PDK CONTROL UNIT. THE NEW DATA RECORDS HAVE IMPROVED THE START AND DRIVE OFF BEHAVIOR OF THE VEHICLE WHEN THE START/STOP SYSTEM IS ACTIVATED AND PROVIDE OPTIMISED IDLE SPEED CONTROL DURING TURNING/MANEUVERING AS WELL AS WHILE DRIVING SLOWLY. PROGRAM THE DME CONTROL UNIT. PDK CONTROL UNIT MUST ALSO BE REPROGRAMMED ON VEHICLES WITH PORSCHE DOPPELKUPPLUNG (PDK). MODELS PANAMERA S, PANAMERA 4S, PANAMERA TURBO. *PE
