As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO BLOCK IN DEN DUE TO NR 1 ELAC (ELEVATOR AILERON COMPUTER) FAULT. MAINTENANCE REMOVED AND REPLACED THE RIGHT BLUE SYSTEM ELEVATOR SERVO AND PERFORMED OPERATIONAL AND LEAK CHECK, REFERENCE AMM 27-34-51 PB 401 AND 27-34-00-820-002. MAINTENANCE SUSPECTS INTERNAL BINDING OR HYDRAULIC LOCK IN SERVO.