As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT 2405: NR 2 BLEED HOT CAUTION LIGHT CAME ON AFTER START. MAINTENANCE REMOVED AND REPLACED NR 2 ENGINE NACELLE DUCT LEAK OVERTEMP SWITCH AND BLEED OVERTEMP SWITCH IAW Q400 AMM 36-11-21-000/400-801 AND 36-11-16-400-801. GROUND RAN AIRCRAFT AT VARIOUS BLEED SETTINGS FOR APPROXIMATELY 10 MINUTES. CAUTION MESSAGE DID NOT REAPPEAR. AIRCRAFT RETURNED TO SERVICE.