As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUME EVENT DESCENDING 7,000 SMELL VINEGAR-PER TSM 05-50-00-810-831 RAN BOTH PACKS ON APU BLEED NO SIGN OF CONTAMINATION.RAN BOTH ENG BLEED FOUND NO CONTAMINATION FROM ENG#2 PACKS 2 BUT HAD ODOR FROM ENG#1 PACK1.R/R BOTH RECIRCULATION FILTERS IAW AMM 21-21-41.A/C OK FOR SVC