Just an idea...
Having had a 165, I noticed that some of the inner workings could get clogged up. Then a jet wouldn't work and it would go in circles. They sent me a new innards under warranty...I don't know how yours works. Maybe soaking it in a bucket of diluted muriatic acid? If it's not working, why not? It's a loss anyway. Just remove the belts and other sundry items that you know aren't the problem.
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