Yamaha PX3 hiccup

My PX 3 linear tracking turntable has just developed a problem - arm does not return completely after playing a side of a record. Feels mechanical but not sure. Platter keeps turning as it does not reach end to activate switch off device.

I have put out word to techs who assisted before but just checking if anyone has had similar experiences and wants to chip in some advice or suggestions

Thanks

CR