As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNING ODOR IN CABIN AND FLIGHT DECK WITH LOSS OF INTERPHONE. CAPTAIN PULLED THE CIRCUIT BREAKER M1 AS A PRECAUTION. RESET CIRCUIT BREAKERS M1 & J1, AND FOUND ALL PA INTERPHONE LIGHTS ILLUMINATED WITH AN AUDIO POP SOUND OVER ALL SPEAKERS. INSPECTED WIRING AT BOTH F/A STATIONS, PA AMPLIFIER & PA ELECTRICAL UNIT WITH NO DEFECTS NOTED. FOUND BURNED ODOR COMING FROM PA ELECTRICAL UNIT. R & R THE PA ELECTRICAL UNIT, OPS CHECKED GOOD IAW 23-30-02. OK FOR SERVICE.