As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REMOVED FROM A/C AS THE CB POPPED. UPON TEAR DOWN DISCOVERED THE DME PCB (P/N 53543-820-2) HAD OBVIOUS INTERNAL PROBLEMS. RESISTOR AT LOCATOR R915 SHOWS OVERHEATING AND RESISTOR AT LOCATOR R907 WAS COMPLETELY BURNT WITH BOARD MATERIAL (SEVERAL LAYERS) IMMEDIATELY UNDER RESISTOR LOCATION BURNT.