As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2348: AFTER ABOUT 20 SECONDS OF TAXI IN SEA, THE MASTER CAUTION CAME ON ALONG WITH THE NOSE WHEEL STEERING CAUTION LIGHT. FOLLOWED CHECKLIST AND BOTH LIGHTS CAME ON WITHIN ABOUT 2-3 SECONDS. TAXIED BACK TO GATE. MAINTENANCE REMOVED AND REPLACED NOSEWHEEL STEERING MANIFOLD IAW Q400 AMM TASK 32-51-16-000-801 AND 32-51-16-400-801. OPS CHECK GOOD. NO FURTHER DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE.