What was found
CONTROL UNIT FOR EXTERNAL LIGHTS HAS INTERNAL SHORT. TRIPPED CIRCUIT BREAKERS UPON INSTALLATION. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
CONTROL UNIT FOR EXTERNAL LIGHTS HAS INTERNAL SHORT. TRIPPED CIRCUIT BREAKERS UPON INSTALLATION. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.