As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DC ESSENTIAL BUSS CAUTION LIGHT ILLUMINATED IN FLIGHT. COMPLIED WITH EMERGENCY PROCEDURE AND PROCEEDED AND TERMINATED FLIGHT. FOUND NR 1 GENERATOR HAD FAILED. REPLACED NR 1 GENERATOR WITH SERVICEABLE UNIT. AIRCRAFT GROUND RUN AND FUNCTIONAL CHECKED GOOD IAW MM. (K)