As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DETECTED ODOR OF BURNING RUBBER DURING DESCENT. ODOR IN CABIN, NOT IN COURIER AREA. NO SMOKE LIGHTS OR ABNORMAL TEMPS. SECURED LEFT PACK AS A PRECAUTION AND ODOR SEEMED TO DISIPATE. INSPECTED LEFT PACK AIR INLET AND PERFORMED OPERATIONAL TEST IAW AMM 21-51-00. NO DEFECTS NOTED. SYSTEM OPS CHECKS NORMAL.