As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE INSTALLING NEW J. P. INSTRUMENT, REMOVAL OF CIRCUIT BREAKER PANEL REVEALED THE BATTERY BREAKER LINE LEAD WAS CONTACTING THE INSTRUMENT PANEL SUPPORT STRUCTURE AND HAD BURNED A PENCIL SIZED HOLE IN STRUCTURE. IT APPEARED THIS WAS FACTORY INSTALLED. RELIEVED PANEL STRUCTURE AND INSTALLED SMALLER DIMENSION BREAKER, AND PLASTIC SHIELD. (X)