As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNING RUBBER ODOR IN AREA OF ROWS 29 - 31 APPROX 1 HOUR PRIOR TO THE PACK TEMP MESSAGE. ODOR DISAPPEARED WITHIN 5 MINS OF DETECTION, BUT ODOR WAS STRONG. REPLACED RT PACK TEMP CONTROL VALVE AND LT PACK COMPRESSOR TEMP SENSOR TS41. PACK OPS NORMAL. NO ODOR DETECTED.