We had a similar problem about a year ago. Having tried numerous methods to isolate the source of unwanted emissions, I was lying on my back looking up at the base panels of the product (it was mounted on legs). I realised that an external cable that took the Ethernet signal from one part of the enclosure to another did not have any ferrites (all our cables have ferrites as standard practice it is not worth the test time to find those that do and those that do not really need them). Although the cable was only about 12 inches long, adding ferrites close to the connectors solved the problem.
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