As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - AFT F/A REPORTS AN UNUSUAL ODOR FROM ROW 17 TO THE AFT GALLEY. PLACED THE RECIRC FAN ON MEL 21-20-2. CLEARED MEL 7/28. PERFORMED OPERATIONAL TEST OF THE RECIRC FAN IAW Q400 AMM SUBTASK 21-22-16-710-001. OPS CHECK GOOD. NO UNUSUAL ODOR DETECTED. RETURNED TO SERVICE. NO PARTS REPLACED.