As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT 2297, TAXIING OUT TO THE RUNDWAY THE PROP HEAT LIGHT WAS ON AND PROP DEICE WAS NOT SELECTED. TRIED TO RECYCLE THE SYSTEM WITH NO SUCCESS. THE LEFT B-PHASE IS SHOWING 28 VOLTS AND OTHER PHASES WERE AT 14 VOLTS, THE PROP HEAT WILL NOT CYCLE. MAINTENANCE REPLACED THE K3 RELAY. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.