As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MECHANICS REPORT-PILOTS REPORTED SPARKING AND ELECTRICAL BURNING SMELL UPON AIRCRAFT START UP. AIRCRAFT WAS SHUT DOWN. UPON INSPECTION BOTTOM OF POWER SUPPLY MELTED AND INTERNAL COMPONENTS MELTED AND DESTROYED. IT CAUSED TWO SQUARE INCHES OF INSULATION TO BE SINGED AND ASH DEPOSITS TO BE LEFT IN AREA OF PROBLEM. EXACT LOCATION IS ABOVE RIGHT SIDE WINDOW 2 AFT IN CABIN AREA. INSPECTED ALL POWER SUPPLIES IN CABIN AND NO SIGNS OF DEFECTS FOUND.