As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT NR 2454: NR 3 HYD PRESSURE INDICATION INOPERATIVE. AIRCRAFT RETURNED TO BLOCK. MAINTENANCE REPLACED NR 3 ISO VALVE SWITCH ASSEMBLY. OPERATED NR 3 HYD SYSTEM. ALL INDICATIONS AND OPERATIONS NORMAL. AIRCRAFT RETURNED TO SERVICE.