As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT, RECEIVED A NR 2 BLEED HOT CAUTION LIGHT, DUCT TEMP COOL, SHUT BLEED OFF IAW CHECKLIST. LIGHT REMAINED ON AFTER SHUTDOWN. NO EVIDENCE OF ACTUAL OVERHEAT CONDITION. BLEED OPS NORMAL OTHERWISE. MAINTENANCE REMOVED AND REPLACED NR 2 BLEED OVERTEMP SWITCH IAW Q400 AMM TASKS 36-11-16-000-801 AND 36-11-16-400-801. NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE.