Given their simplicity, I'd wonder if it's worth it as long as it's still working.
The only one I had fault, the insulation let go and it earthed out. So I would check that at a minimum.
Edit: As Jen just said, the one I had that was stuffed I replaced with one from Classic Oz Wreck that had been checked and was all smicko. The guy that bought the wagon off me that it was in has complained about every other little thing that died since he got it, so it much still be great, haha.
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