As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#300, MSY-BOS. "FUME EVENT ABOUT 5000FT. SEE FORM. ( APU SYSTEM ); MDDR CLEARED REF TSI 75479 AND MDDR 593792((RESOLVED ON W/O: 1438452 TASKCARD: NR-00003) ACCOMPLISHED LEVEL B ECS CONTAMINATION PER AMM 21-00-00. NO ODORS PRESENT WITH APU BLEED OR ENGINE BLEED. MDDR CLEARED, MX4 UPDATED). MX 4 UPDATED.