What was found
INTERMITTENT FUMES OF UNKNOWN ORGIN SMELLED IN THE COCKPIT APPROX 1.5 HOUR INTO THE FLIGHT FL 360 DEFINITE ODER LIKE MATCHES/CIAGRETTE .LASTED 10-15 SECONDS PAX NOT SMOKING, A/C POWER OFF BRIEFLY SMELLED AGAIN ON DOWNWIND SHORT FINAL AND TAXI AFTER SHUTDOWN INTERMITTENT WEAK ODER IN VICINITY OF VESTIBULE. REMOVED FWD CLOSET SIDEWALL PANELS AND VISUALLY INSPECTED ALL ELECTRICAL WIRING AND COMPONENTS. OPENED ACCESS PANELS ON DA PANEL AND VISUALLY INSPECTED ALL ELECTRICAL WIRING AND COMPONENTS. NO DEFECTS NOTED. REMOVED PILOTS AND CO-PILOTS PDU’S AND VISUALLY INSPECTED ALL WIRING AND COMPONENTS BEHIND COCKPIT DASH. NO DEFECTS NOTED. REMOVED LT COCKPIT SIDEWALL LINER AND VISUALLY INSPECTED ALL WIRING, B SCREEN WINDOW HEAT FILTER AND TERMINAL BLOCK PSA AND PW. VISUALLY INSPECTED LT A SCREEN WINDSCREEN HEAT TERMINAL BLOCK PKA AND FILTER UNIT. NO DEFECTS NOTED. REMOVED RT COCKPIT SIDEWALL LINER AND VISUALLY INSPECTED B SCREEN WINDSCREEN HEAT FILTER AND TERMINAL BLOCK PLT AND PX. VISUALLY INSPECTED A SCREEN WINDSCREEN HEAT TERMINAL BLOCK PLA AND FILTER UNIT. NO DEFECTS NOTED. VISUALLY INSPECTED ALL TERMINAL STRIPS ATTACHED TO PILOT’S A AND B SCREENS AND COPILOT’S A AND B SCREENS. NO DEFECTS NOTED. PULLED AND RESET ALL CIRCUIT BREAKERS ON DA PANEL. REINSTALLED RH SIDEWALL LINER. RAN APU FOR 2 HOURS. POWERED BUSES PE, PS1 AND PS2. TURNED ON INVERTERS AND POWERED AC BUSES XS1 AND XS2. TURNED ON BLEED AIR. CHECKED FOR FUMES AND/OR ODORS. NONE DETECTED. STARTED NR1 AND NR2 ENGINES, OPENED MAIN AIR VALVES NR1 AND NR2. RAN WINDSCREEN HEAT AND PITOT HEAT. RAN ENGINES FOR 1.5 HOURS, CHECKED FOR FUMES AND/OR ODORS. NONE DETECTED. REINSTALLED FWD CLOSET SIDEWALL PANELS. CLOSED DA ACCESS PANELS. ALL WORK COMPLETED IAW AMM CH 24-50-00 AND 25-10. PERFORMED SMOKE DETECTOR FUNCTIONAL TEST. NO DEFECTS NOTED. REF AMM CH 26-11-00.