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That could be caused by any number of things. Low input voltage, a bad relay or bad start capacitor. Some testing would be needed to sort that out. Most of those parts are still available, even though these have been out of production for some time now. Hope that proves helpful here. Please get back to me if you need more as all follow ups are included in our fee.
Just checking back in to see if perhaps you missed my earlier response to your question or if you need more input from me on this issue?