Am struggling with ArcPy.
Can someone help with a script to identify missing layers (red arrow in TOC) and then to search for the correct file locations & then update the mxd.
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Any script to do this will need to start by using ListBrokenDataSources which:
Returns a Python list of Layer objects within a map document (.mxd) or layer (.lyr) file that have broken connections to their original source data.
Once you have your script started using the example code at that link, then you will be ready to tackle the remainder. If you get stuck then ask a new question, showing us your code so far, and any error messages that you are receiving.