What was found
STRONG ELECTRICAL SMOKE SMELL IN COCKPIT COMING FROM VENTS.-REMOVED EXTERNAL AIR NO HELP, NO FAULTS IN AEVC SYSTEM (FANS , BLOWERS). ISOLATED PACKS, SMELL STILL PRESENT. R/R RECIRCULATION FILTERS, OPERATED PACKS SMELL ALLEVIATED. SLIGHT ODOR WHEN EXTERNAL POWER APPLIED, NO SMELL WHEN DISCONNECTED. DETERMINED ODOR TO BE COMING FROM BEHIND FO'S SEAT BELOW PANEL 123VU AT CONTACTORS 3XG AND 3XS. R/R CONTACTORS 3XG AND 3XS PER AMM 24-41-55. NO EVIDENCE OF SMELL AT THIS TIME.