Finder's Mac Help gone; how do I get it back?

When I open Mac Help in the finder, the Help Viwer window opens but no contents appear. If I click on Home in that window, I get contents, but the links do not work. If I choose topics from the Help Viewer's Library menu, most work but Apple Script, Mail and Safari Help windows open with no contents (same as Mac Help above). I have repaired permissions. My questions:
1. Where does help live? I can't find it in Applications or in Library.
2. I wasn't doing anything unusual when it got messed up.
3. How do I get back just the parts of Mac Help I have lost?
Thanks for your help.

Try this:
In most cases doing the following will restore the Help Viewer:
1. Trash the following three files, if extant:
/Home/Library/Preferences/com.apple.help.plist
/Home/Library/Preferences/com.apple.helpui.plist
/Home/Library/Preferences/com.apple.helpviewer.plist
2. Trash the /Home/Library/Caches/com.apple.helpui folder.
3. Empty the Trash and Restart.

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