As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INVESTIGATED PILOT COMPLAINT OF UNSUCCESSFUL BATTERY FEEDER PREFLIGHT TESTS. PROBLEM RECTIFIED AFTER TROUBLESHOOTING BY REPLACEMENT OF PN 50284-003 DC GROUND FAULT PROTECTION PANEL (MFG) PART TSN/TSOH UNKNOWN. HAVE NOTED THIS PART PREVIOUSLY TO BE SOURCE OF SIMILAR COMPLAINTS. A/C TT:3336.1 HRS/2693 CYCLES.