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The trailing arm bearings are not serviceable units on the W123. You need to replace them if they are worn. There's a limit for the axial play in the FSM (sorry can't remember it - look it up on the startek site).
You might want to try a bit of self applied lubrication. It might help enough for problem identification purposes but won't provide any long term solution.
When checking these hubs, however, don't forget that one wheel on these open differentials will always spin more easily than the other. Also when comparing temperatures it is probably best to measure just in case there's a psychological effect creeping into the analysis!
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