The Auto Lister does require valid UPCs in order to be able to provide suggestions for you and should run every other day for your account - so it should be providing suggestions for eligible items in that time frame automatically. There are no tools within your account where you could force that to run again.
If you have items with appropriate UPCs for them where this has not occurred and they have been showing in your account for 48 hours or more, please feel free to file a support case from under the Help tab of the site and provide some titles or item numbers of items where this is occurring for you and our support team will be happy to look into it.
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