What was found
SMELL OF FUMES ON FLT DECK DURING FLIGHT, SMELLED LIKE POPCORN, FA 1 & FA 2 SMELLED STRONG SMELL BY THE EMERGENCY EXIT. SMELL LASTED 20 MIN THEN SUBSIDED BOTH PACKS ON & RECIR FAN, TURN FAN OFF SMELLED POPCORN BURNING REMAINED. UPON MTX ARRIVAL FOUND POPCORN REMAINS ON SEAT AND FLOOR OF R/H SIDE OF AIRCRAFT BETWEEN FIRST CLASS AND COACH, AND FOUND NO LINGERING AROMA. OPERATED CABIN LED, PSU, EMERGENCY LIGHTS, OPS CHECK GOOD. IAW AMM 33-21-00. FLASHLIGHTS, COFFEE MAKERS, GALLEY EQUIPMENT, NO AROMA NOTED. ENTERED FWD AVIONCS COMPARTMENT, AT SERVICE COMPARTMENT-OUTFLOW VALVE EXIT. NO AROMA. OPERATED PACK 1 AND PACK 2 UTILIZED APU, AND ENGINE BLEEDS IAW AMM 21-51-00. NO AROMA. FOUND NO CIRCUIT BREAKERS TRIPPED. DURING INSPECTION FOUND NO AROMA