Here is a schematic for 5V references. If you need any assistance please don't hesitate to ask. Just make sure you have the majority of them unplugged and find a circuit to test. If your test circuit is at 5V start plugging the other circuits back in one at a time. When you plug one in and your voltage drops on your test circuit you've found your problem. Check for shorts and opens on that circuit and test the component if possible.
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