As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2320: NR 2 BLEED HOT CAUTION LIGHT ILLUMINATED AT 12,000 FT. AIRCRAFT RETURNED TO FIELD. MAINTENANCE REMOVED AND REPLACED NR 2 HP SHUTOFF VALVE IAW Q400 AMM 36-11-09, PG 401-406. GROUND RAN NR 2 ENGINE WITH NR 2 BLEED ON AND NR 2 BLEED HOT CAUTION DID NOT REOCCUR. AIRCRAFT RETURNED TO SERVICE.