(Renton, WA)  --  Seahawks running back Marshawn Lynch is in Philadelphia to see a specialist about his abdominal injury.  Head coach Pete Carroll says he doesn't know yet whether Lynch will require surgery, but it is a possibility.  Lynch is doubtful for this Sunday's game against the Pittsburgh Steelers.  Thomas Rawls, who rushed for 209 yards against San Francisco this past Sunday, will likely start should Lynch be unavailable.