2006 Forester EJ253AVAFB with a P0442code. Looking for some troubleshooting info to prove the fault. So far I have only verified the Purge Control Solenoid valve is good by removing the vacuum line from the manifold and applying vacuum, watching for 20 minutes and saw that there was no loss of vacuum. I think this proves that there is no leak at the valve. Would like to prove the Drain Valve, which on this year is built into the Vapor Canister, is sealing when power is applied but I can only find guides on the separately mounted valve. The canister is a bit costly to replace on a hunch. Also any other tips on checking the pressure control solenoid valve, fuel tank roll over valves or any other possibilities would be welcome.