In the Links panel, highlight the images you want to relink (shift + click to select a range), and click on the leftmost icon at the bottom of the panel (looks like two chain links). You'll be presented with a menu to locate your missing links. If the links in the panel show a yellow rectangle next to them, the link simply needs to be updated, and to do that you click the update icon at the bottom of the links panel.
Hope that helps.
Thanks for your help!
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