As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT (ABOUT 15 MINUTES FROM SEA) THE CREW RECEIVED A STAB LOCK FAULT EICAS MESSAGE. THEY HAVE DECLARED AN EMERGENCY AND WILL BE LANDING IN PDX. PDX HAS BEEN NOTIFIED AND WAS ASSIGNED A GATE. AN FCND WAS RECEIVED UPON LANDING AND THE AIRCRAFT TAXIED TO THE GATE UNDER ITS OWN POWER. MAINTENANCE FAULTING A SHORT ON THE HSTA MOTOR ASSEMBLY. R&R HS-ACE IAW AMM 27-43-01, R&R RT HSTA MOTOR ASSEMBLY IAW AMM 27-42-03. OPS CHECK GOOD OK FOR SVC.