As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT RETURNED TO BASE FOR ELECTRICAL AND AVIONICS DIFFICULTIES. ON RETURN, AIRCRAFT BATTERY DEPLETED CAUSING MULTIPLE ELECTRICAL AND AVIONICS PROBLEMS. PILOTS INITIATED PRECAUTIONARY MANUAL GEAR EXTENSION DUE TO LACK OF POSITIVE GEAR EXTEND INDICATION AT NO TIME DID EITHER ALTERNATOR FAIL LIGHT ILLUMINATE. UPON INSPECTION, FOUND RT ALTERNATOR BATTERY POST BROKEN AND SHORTING ON STARTER CASE INSTALLED BELOW ALTERNATOR.