What was found
SMOKE SMELL IN CABIN STARTED AT ROW 27 AND STARTED DRIFTING AFT IN CABIN. SMELL ONLY NO VISABLE SMOKE. REPLACED RECIRC FILTERS RT SIDE. LT RECIRC FILTERS FOUND CLEAN. INSP PSU'S AND CABIN LIGHTING COMPONENTS. INSP OVERHEAD BINS. RAN ENGS AND OPERATED PACKS PER PFHB NO ODORS OR VAPORS PRESENT. INSP BAG BINS REVEALED NOTHING. ALSO, INSP PAX BAGS CARRY ON AND IN BINS NO ODORS. THIS IS A DIVERSION W/EMERG UNITS CALLED.