As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 4334 - CREW REPORTED A RUBBER ODOR IN MAIN CABIN AND COCKPIT IN FLIGHT. SHUT OFF GASPER AND RECIRCULATION FANS AND ODOR DECREASED. MAINTENANCE COULD NOT DUPLICATE DISCREPANCY. PERFORMED GROUND OPERATIONAL CHECK OF APU AND AIRCRAFT BLEED SYSTEMS AND DETECTED NO ODOR. AIRCRAFT WAS RETURNED TO SERVICE. (M)