What was found
ATB-FUME EVENT CABIN CREW NOTIFIED US SHORTLY AFTER TO OF "BURNING POPCORN" SMELL NEAR 3R DOOR. SMELL MOVED FWD TO ROWS 11-27. CONSTANT, NOT DISSAPATING FOR CLIMB, CRUISE, OR DESCENT. APU BLEED USED @ 10K TO LANDING. SMELL DISSAPATED. PERFORMED DUAL ENG WASH PER TASK CARD E1128-321-72-007. OPERATED #1 AND #2 ENG'S AND ISOLATED PACKS 1 & 2. NO SMELL NOTED. OPERATED PACKS WITH APU NO SMELL NOTED. PERFORMED LEVEL A DECONTAMINATION REF AMM 21-00-00 NO DEFECTS NOTED OK FOR SVC.