As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT INTO PHX EN ROUTE FROM PHL AT APPROXIMATELY 12000 FT THE FLIGHT ATTENDANT AND PASSENGERS COMPLAINED OF A STRONG ODOR SIMILAR TO BURNING RUBBER. MAINTENANCE REMOVED AND REPLACED RECIRCULATION FILTER CARTRIDGE IAW AMM TASK 21-21-000-001. RAN BOTH ENGINES NO ODOR WAS PRESENT.