What was found
FUME EVENT IN CRUISE, ISOLATED PACK 2, SMELL WENT AWAY. AT FL 180 SMELL CAME BACK. (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.