The PPPoE password is encrypted using a propietary method, so unfortunately I can't tell you what it is (actually I don't even know exactly how it's done, but I know it's not something we're going to put in this thread). The only thing I could suggest is type the password into a local test 3002 first and then check the config file, then before you ship out the 3002 cut/paste that encrpyted password into it's config file.
There's no documentation around about the config file, primarily because we don't really want people making changes to it in order to configure their 30xx. It's easy to get a value wrong and then mess up your config completely.