What was found
AFTER ENGINES ARE SHUTDOWN WITH APU RUNNING AND BLEED AIR ON APU, THE CABIN FILLS WITH A VERY HEAVY JET FUEL SMELL. THIS WAS POINTED OUT BY PASSENGERS AS WELL. WHEN AIRCRAFT WAS SHUTDOWN WINDS WERE CALM. REMOVED TEMP CONTROLLER AND INSTALLED OVERHAULED CONDITION TEMP CONTROLLER JAW CE680 AMM 21-61-00. TECHS PERFORMED ECU DUCT BUMOUT/OEAN PROCEDURE IAW TC-C68-21-1001. TECHS PERFORMED ECU OPS AND FUNCTIONAL CHECKS JAW AMM 21-61-00, OPS AND FUNCTIONAL CHECKS GOOD WITH NO DEFECTS NOTED. NO FURTHER OII/EXHAUST SMELL COMING FROM CABIN/COCKPIT GASPER DUCTS.