Are you sure they're all manual line breaks, not paragraph breaks? Turn on Word's formatting display by clicking on the ¶ symbol on the Ribbon's Home tab. The manual line breaks will look like ↵ and the paragraph breaks will look like ¶.

Also, make sure the Find textbox isn't set to look for particular formats. In the Find/Replace dialogue, if there's any text under the Find textbox, select it, click on 'More', then 'No formatting'. Do the same for the Replace textbox.

Finally, make sure the Find textbox only has the ^l in it (e.g. no spaces before/after); otherwise it'll only find those that have the same content.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]