As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YELLOW HYD TEMP CAME ON IN FLT ENGINE 2 VALVE (NIPS) LIGHT STAYED ON WITH VALVE SHUT. HYD PRESS ON YELLOW STAYED AT 3100 PSI WITH VALVE SWITCH IN OFF POSITION. REMOVED AND REPLACED YELLOW HYD ISO VALVE P/N ON & OFF HTE9531-3, S/N ON FRTR023AX.