As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - FLIGHT 2328 ENGINE ADAPT HEATER 1 CAUTION LIGHT ILLUMINATED. ENGINE INTAKE HEATER ON NR 1 SIDE (LIGHT) WENT DARK. COMPLIED WITH OPERATIONAL CHECK OF NR 1 AND 2 ENGINE INTAKE HEATERS IAW 400 MM-30-21-00 CHECKS GOOD. RESET CIRCUIT BREAKER. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.