As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2104 - AFTER COMPLETING AUTO FEATHER TEST, NR 2 SPU AUX POWER CAUTION LIGHT ILLUMINATED AND REMAINED ILLUMINATED. MAINTENANCE RESET CIRCUIT BREAKER 2921-C/B6. OPERATIONAL CHECK GOOD NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.