As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STONG ODOR CHEMICAL AT APPROOX 4000 TURNED OFF PAC ONE AN DIRTY SOCK ODOR WENT AWAY. ( 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 FAULT ISOLATION FOR FUME EVENT FOUND NO CONTAMINATION IN APU DEOILER SEALS USED AERO TRACER FOUND PAC 1 TO BE THE SOURCE OF ODOR IAW TSM 05-50-810-831