Thanks to all for taking the time to respond. On the advice of others and based on the fact that I found a small piece of metal on the magnet (big enough to roll around on my fingers) we decided to take the gearbox apart here at Dakar Motos. What we found was that 5 of the 6 bearings were worn, some more than others. One in particular was obviously worn on the outside (the rear bearing of the input shaft gear). Other than the worn bearings everything seemed to be OK and the gearbox is now back together. Hopefully this change of bearings will resolve the issue!
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