What was found
"FA SMELLED SMOKE MID-CABIN (ROAW 14) NO VISIBLE SMOKE. POSSIBLE SOURCE CABIN AIR SUPPLY VENTS. TURNED OFF PACK 2 AND SHUT XBLEED PER CHECK LIST. ODOR DISSIPATED. OCURRED AT CRUISE FL370.-PERFORMED TSM 71-00-00810-801-A STEPS 3A TO 4C. REMOVED & REPLACED DE OILER SEALS ENG1 & ENG2 IAW AMM 72-60-31. PERFORMED TSM 05-50-00-810-831 RUN BOTH ENGINES BLEEDS SEQUENTIALLY USING PACK1 & PACK2. RUN PACK # 2 DECONTAMINATION IAW AMM 21-00-00. NO SMELL NOTED. R & R RECIRCULATION FILTERS IAW AMM 21-41-00."