Hi friends, thank you for answering. The new Seatac runway 34L was opened Nov 8 2008. My scenery map for US was downloaded two days ago- 10 years later, and reports " Updated". Understand that the downloaded files has not been updated- correctly.
Have tried to locate an update on AVSIM Library for Seatac, but at no luck.
( On final with APPR armed -autopilot on, and on GS all the way- can see the three runways- but offset to 34 L)
Best regards John R.