Engine Code P0441 2002 Galant Where?

Engine light came on today while driving. Mitsubishi Galant 2002 4 cyl. Autozone ran code test and came up with P0441 which gives a choice of 4 possible problems

1. Faulty Gas Cap or loose cap (Faulty fault tank pressure (FTP) sensor)
2. Faulty Purge Solenoid
3. Blocked Canister
4. Faulty Vent Solenoid

Replaced the gas cap- no luck. They suggested that it might be a faulty vent hose. Checked all parts above on system and all are dealer parts. I have found some on ebay so at least I know what they might look like.

Does anyone know where any of these parts are located and how I might locate the vent hose to see if there is a problem? I don't have a parts/service book and not sure if they are listed in one anyway.

Any help would be appreciated. It happened to rain a bunch here while I was driving if anyone thinks that may have an effect also. The Autozone guy said that it is something that I should have looked at because if it was a blocked cannister for example, the problem would affect the gas mileage.

Thanks In Advance
Chuck