What was found
MILD FUMES IN CABIN APPROXIMATELY AT ROW 6 NOTED BY FA "A" AND PASSENGERS IN ROW DURING DESCENT. NO VISIBLE PLUME OBSERVED AND FAINT ODOR DETECTED BY THE FO AFTER LANDING. SMELL INCREASED PRIOR TO LANDNG WHEN GEAR EXTENDED TYPE 1 AND TYPE IV FLUID HAD BEEN APPLIED BACK IN FAI. EMERGENCY DECLARED. LANDING UNEVENTFUL. REMOVED FROM SERVICE. C/W FIM 21-20-00-810-801-A & FORM M-744. NO DEFECTS OR ABNORMAL SMELLS NOTED. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.