What was found
PDX FLIGHT NR 2265: FA REPORTS EXHAUST ODOR IN REAR OF AC ON APPROACH. PAX REPORTS FEELING SICK FROM ODOR. MAINTENANCE DUPLICATED ODOR USING NR 2 BLEED. C/W FIM 71-00-00-810-817. NO FAULT CODE IN CDS. NO OILY RESIDUE FOUND ON P2.2, P2.7 VALVES, P3.0 DUC OR THE HPSOV PRE COOLER DUCT. C/W BSI IAW Q400 AMM TASK 72-00-00-290-803, PAR 4 AND TASK 72-00-00-290-804. NO DEFECTS NOTED. COMPLETED GROUND RUNS FOR FCS CONTAMINATION IAQ Q400 SL 21-012A. NO FURTHER UNPLEASANT ODORS FOUND. COMPLETED FIM TASK 71-00-00-810-817. FOUND VERT-STAB LOWERED DUCT CHECK VALVE NOT COMPLETELY CLOSING. CLEANED AND LUBED DUCT CHECK VALVE. OPS CHECK GOOD. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.