What was found
SMELLED ODOR DESENDING THROUGH FL300; F/A CONFIRMED. SWITCHED OVER TO APU BLEED AT LOWER ALT, F/A CONTINUED TO SMELL & FELT SICK. CREW DID NOT SMELL ANYMORE. F/A NR 2 USED PORTABLE OXYGEN BOTTLE. ON ARRIVAL CHECKED NR 1 & 2 ENGINE INLET & EXHAUST AREA, CHECKED NR 1 & 2 PACK INLETS & EXHAUST AREA, CHECK APU INLET & EXHAUST AREA. ALL CHECK CLEAN & NO LEAKS DETECTED. REMOVED AND REPLACED NR 1 PACK'S OZONE FILTER PER 21-51-41-401. FILTER CHECKED CLEAN (REINSTALLED SAME FILTER). GAIN ACCESS TO RECIRCULATION FILTER PER 21-21-41, CK'D GOOD. CHECK LAV AND GALLEY FILTER, CHECK CLEAN. RAN PACKS FOR 2 HRS, SYSTEM CHECKED NORMAL. NO ODOR DETECTED. REMOVED AND REPLACED FWD / LT POB PER 35-11-41. LEAK CHECK GOO