As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUMES REPORTED IN DEC. TO ATL MORE IN AFT CABIN ( PACKS A320 WITH MOD 31283/MP P7125 (FWC H2-F1 STND) AND WITH MOD. 30626/MP K6443 (ENHANCED ECS) - FAULT CAUTIONS ASSOCIATED WITH OPERATIVE SIDE NOT DISPLAYED )-PERFORMED TSM 05-50-00-810-831-A. ISOLATED PACK 2 AS POSSIBLE CAUSE FOR ODOR EVENT