As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. PASSENGER COMMENTED ON FUMES IN CABIN IN FLIGHT WHILE EXITING A/C AT DESTINATION. FOUND APU TO BE BAD. REPLACED OIL COOLING FAN AND RETURN LINE PER AMM 49-52-51. (EVENT IS A RE-OCCURANCE SEE ORIGINAL AALA201610289011 AND AALA201611079015).