As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - FLIGHT 2189 - THE FLIGHT RETURNED TO FIELD WHEN THE CREW RECEIVED A RUDD FULL PRESS CAUTION LIGHT. MAINTENANCE INSPECTED THE AIRCRAFT AND REPLACED CONNECTOR 2721-P3, 2721-P4, AND TERMINAL BLOCK 2721-TB1. OPERATIONAL CHECKS WERE GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.