As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT NR 2422: FA REPORTED BURNING SMELL IN ROWS 11 AND BACK. MAINTENANCE GROUND RAN AIRCRAFT. CYCLED BLEEDS NR 1 AND NR 2 ON AND OFF. COULD NOT DUPLICATE SMELL. FA REPORTED ONLY SMELL, NO SIGN OF SMOKE. NO PARTS REPLACED. AIRCRAFT OK FOR CONTINUED SERVICE.