As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2498: STANDBY HYD PRESSURE INDICATOR INOP. AIRCRAFT RETURNED TO BLOCK, MAINTENANCE HAS PLACED THIS ON MEL. AIRCRAFT WAS RETURNED TO SERVICE. MAINTENANCE FOUND THE NR 3 HYD SYSTEM TO BE DASHES. REMOVED AND REPLACED NR 3 HYD PRESSURE TRANSDUCER IAW Q400 AMM TASK 29-30-01-400-801. OPERATED NR 3 AND STBY HYD SYSTEMS, INDICATIONS NORMAL. AIRCRAFT RETURNED TO SERVICE