As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOTS DISCOVERED AUX DC CONV CIRCUIT BREAKER POPPED AFTER LAV WOULD NOT FLUSH. BREAKER WAS RESET, IT IMMEDIATELY POPPED AGAIN WITH SMALL AMOUNT OF SMOKE EMANATING FROM CABIN CONVERTER, ID 106A1. BREAKER SECURED. FLIGHT COMPLETED SANS FLUSH TOILETS AND CABIN READING LIGHTS. NEW UNIT INSTALLED. OPERATIONAL CHECK SATISFACTORY. NOTE: THE FAILED UNIT SERIAL NUMBER WAS WELL ABOVE THE RANGE AFFECTED TO UPDATE TO MOD 5 STATUS PER GAC AND KGS.