Look in Applications/Utilities for Keychain Manager. It has a lot of useful options, including Keychain First Aid, plus the ability to set the password for any keychain.
Look for a keychain called "login" and set the password to the new one--maybe that's all you need to do? (I think you select the keychain from the list, but make sure none of the items IN the keychain is highlighted. Then do File> Get Info. I seem to recall that Get Info with one of the items selected will get info on that ONE item and not the whole keychain. If something unwanted is selected, just command-click it.)
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