As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - FLIGHT 2322 - NR 2 BLEED HOT CAUTION LIGHT ILLUMINATED. DUCT TEMP WAS 30 DEGREES C. RAN CHECKLIST, CAUTION WENT OUT. TURNED BLEED BACK ON, DUCT WAS AT 20 DEGREES AND CAUTION CAME BACK ON. NO HEAT IN FLIGHT COMPARTMENT. LEFT BLEED OFF. MAINTENANCE REPLACED THE BLEED OVERTEMP SWITCH. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.