As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#394, DEN-BOS. "LEVEL 1 ODOR DESCENDING THROUGH APPROXIMATELY FL250. ODOR WAS DETECTED DESCENDING THROUGH CLOUDS AND PRECIPITATION ( APU SYSTEM ); ACCOMPLISHED OPS CHK OF APU BLEED IAW AMM 49-51-00. OPS CHK NORMAL. NO ODOR DETECTED. A/C OK TO CONT SVC. MDDR CLEARED. MX-4 UPDATED, PLACARD REMOVED. MCC NOTIFIED."