There is a new TSB (http://www-odi.nhtsa.dot.gov/cars/pr.../tsbsearch.cfm) for Panamera:
"DUE TO DAMAGED O RINGS, POWER STEERING LINES MAY BE LEAKING AT THE STEERING RACK, RESULTING IN AN IMPERFECTION IN THE LINE."

 

what about this one too?

Make : PORSCHE Model : PANAMERA Year : 2012
Manufacturer : PORSCHE CARS NORTH AMERICA, INC.
Service Bulletin Number : TIS-53-11 Date of Bulletin : DEC 16, 2011
NHTSA Item Number : 10043268
Component : ELECTRICAL SYSTEM:STARTER ASSEMBLY
Summary :
PORSCHE: SOME MODEL YEAR VEHICLES ARE EXPERIENCING A REDUCTION IN COMFORT WHEN ENGINE STARTS AFTER SERVERAL ATTEMPTS ARE MADE, USING DRIVER'S KEY. *PE

 

Make : PORSCHE Model : PANAMERA Year : 2012
Manufacturer : PORSCHE CARS NORTH AMERICA, INC.
Service Bulletin Number : ATI-1202 Date of Bulletin : JUN 14, 2012
NHTSA Item Number : 10044607
Component : STEERING:HYDRAULIC POWER ASSIST SYSTEM
Summary :
PORSCHE: DUE TO DAMAGED O RINGS, POWER STEERING LINES MAY BE LEAKING AT THE STEERING RACK, RESULTING IN AN IMPERFECTION IN THE LINE. *PE
Check to Request Research. Submit below.
Make : PORSCHE Model : PANAMERA Year : 2012
Manufacturer : PORSCHE CARS NORTH AMERICA, INC.
Service Bulletin Number : ATI-1202 Date of Bulletin : JUN 14, 2012
NHTSA Item Number : 10044607
Component : STEERING:RACK AND PINION:RACK
Summary :
PORSCHE: DUE TO DAMAGED O RINGS, POWER STEERING LINES MAY BE LEAKING AT THE STEERING RACK, RESULTING IN AN IMPERFECTION IN THE LINE. *PE