As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. FLIGHT ATTENDANT NOTICED A STRONG ACIDIC ODOR IN CABIN FROM ROW 5 AND BACK AS AIRCRAFT APPROACHED GATE, BEFORE DOORS OPENED. MAINTENANCE FOUND A HOLE IN FORWARD CARGO Y-MIXER DUCT AND REPLACED Y-MIXER DUCT PER AMM 21-21-43 AND JOB CARD 26L00021001. SEE ALSO AALA201703089011.