What was found
DURING FLIGHT, CREW SMELLED FUMES IN THE CABIN AND COCKPIT. FUMES SMELLED LIKE OIL OR FUEL WITH THE STRONGEST SOURCE COMING FROM THE AFT PORTION OF THE AIRCRAFT. THIS OCCURRED SEVERAL MINUTES AFTER APU SHUT DOWN. FUMES BEGAN TO DISSIPATE AS THE DESCENT OCCURRED. FOUND FUEL LEAKING FROM THE APU FUEL SHUTOFF SOLENOID VALVE. FUEL FUMES WERE GETTING PICKED UP BY THE APU AND SENT INTO THE CABIN AND COCKPIT. REPLACED SOLENOID VALVE AND LEAK CHECK OK. REPLACED THE LEFT AND RIGHT CONDENSER BAGS. LEAK CHECK OK. NO FUMES IN COCKPIT OR CABIN NOTED. WORK PERFORMED IAW SMM 49-31-07 AND 21-51-13.