As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - AFTER LEVELING AT 23,000 FT, MASTER CAUTION LIGHT WITH ELEVATOR FEEL ANNUNCIATOR WARNING LIGHT ILLUMINATED. AUTO-PILOT WAS TURNED OFF. THERE WAS A NOTICEABLE VIBRATION AT ALL AIRSPEEDS. EMERGENCY CHECKLIST WAS PERFORMED, AIRCRAFT RETURNED TO FIELD WITHOUT FURTHER INCIDENT. AIRCRAFT DOWN FOR MAINTENANCE. MAINTENANCE REPLACED NR 2 PITCH FEEL ACTUATOR. OPERATIONAL CHECK FLIGHT WAS SATISFACTORY. AIRCRAFT RETURNED TO SERVICE.