As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YAW DAMPER DISENGAGED AUTOMATICALLY, YAW DAMPER LIGHT CAME ON AFTER TAKEOFF, THE YAW DAMPER LIGHT ILLUMINATED AND SPD LIM ON CA PFD SPEED TAPE. PERFORMED SMYD TEST, NR 1 HAD FAULT 27-31013. PERFORMED ADIRU BITE TEST, TESTED GOOD. SMYD TEST #2 TEST GOOD. SWAPPED ADIRU 1 & 2. TEST ON SMYD NR 1 SAME RESULTS. RESWAPPED ADIRUS TO ORIGINAL POSITION. NEEDS NEW SMYD NR 1 IAW FIM 27-32 TASK 817. REMOVED AND REPLACED SMYD NR 1 IAW AMM 27-32-42. BITE TESTED GOOD.