As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTS AMMETER INOPERABLE. REMOVED STEWART WARNER 70-AMP METER AND FOUND ONE POST SHORTED TO THE MOUNT TRAY WHERE IT PASSES THROUGH MOUNT HOLE. IT MELTED THE TRAY IN THE AREA OF CONTACT. INSTALLED NEW ROCHESTER 70-AMP GAUGE PER PIPER KIT 765-186V AND PIPER SB 811A. SUBMITTER STATED THIS COULD HAVE LED TO AN IN-FLIGHT FIRE.