As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED HEARING A BANG FROM BEHIND THE CB PANEL AT WHICH TIME THE COCKPIT FILLED WITH SMOKE. FLIGHT ATTENDANT REPORTED SEEING SPARKS FROM THE OVERHEAD PANEL JUST OUTSIDE ON THE FIRST CLASS GALLEY. NO SMOKE REPORTED IN CABIN AREA. SMOKE DISSIPATED AND NORMAL LANDING. FOUND GALLEY POWER CABLES CHAFED AGAINST A/C SUPPLY DUCT CLAMP. REPAIRED WIRING AND DUCT INSULATION. REPLACED DUCT CLAMPS.