As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT AC BUSS CAUTION LIGHT ILLUMINATED IN FLIGHT WITH ASSOCIATED CAUTION LIGHTS. PROBLEM OCCURED TWO MINUTES AFTER SELECTING PROP HEAT ON. ON PREVIOUS THREE LEGS, NO AC BUSS CAUTION LIGHT WITH PROP HEAT SELECTED OFF. R & R 2421-S2. R & R 2421-K2. RAN ENGINES FOR OVER 10 MINUTES. OPS CHECKED ALL ACFT POWER RELATED SYS. NO DISCREPENCIES NOTED AT THIS TIME.