As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THE DC SERVICE/UTLILITY BUSS FAULT LIGHT CAME ON ALONG WITH MULTIPLE FAILURES. THE CREW ELECTED TO RETURN TO DEPARTURE. THE ACFT LANDED WITHOUT INCIDENT AND WAS REMOVED FROM SERVICE. R & R RT ENGINE DC GCU AND DC BPCU IAW JIC 24-32-81, RAI 10000 AND 24-46-83 RAI 10000. THE OPS TEST WAS SATISFACTORY. THE ACFT WAS RETURNED TO SERVICE.