As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CABIN CREW REPORTED SMELLING AN ACRID ODOR ON ARRIVAL. SUSPECT RELATED TO THE PACK 1 OVERHEAT. THE ODOR WAS ABLE TO BE DUPLICATED ONLY WHEN RUNNING PACK 1 OFF THE APU. ACCOMPLISHED CONDITIONAL INSPECTION IAW AMM 05-51-10-200-801-C1, PARA 1, ODOR WAS ISOLATED TO PACK 1. VERIFIED NO RESIDUAL ODOR PRESENT WHEN RUNNING PACK 2. PACK 1 PLACED ON MEL.