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Troubleshooting Trains 7897 & 7939
Hi all, Hope I'm posting to the right area. My son has 2 Lego Train sets, model numbers 7897 & 7939. Recently they have stopped working, and I'm trying to troubleshoot (with no luck) what part it is that has stopped working, so we can try and replace it. But where do I start? Batteries was an obvious one, but all batteries (in both remote and train) have been replaced by new ones. As far as I can tell from the manuals, the 'working' parts are 4427073, 4100355 and remote 4289546 for set 7897 and 4584375,4566756,4578042 and remote 4584345 for set 7939. Do any of these parts have a history of 'breaking down' that require replacement, and would be the first part to replace?
Any help would be appreciated! Immensely!
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