As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - ON FLIGHT 2449, RETURNED TO GATE NR 3 HYDRAULIC PUMP CAUTION LIGHT ILLUMINATED AFTER ENGINE START PRIOR TO TAXI. THE LIGHT ILLUMINATED RIGHT AFTER BRAKE RELEASE FOR TAXI. MAINTENANCE REMOVED AND REPLACED NR 3 HYDRAULIC PUMP. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.