I'll try something better-than-nothing stuff - like how I would try to deal with such thing..
First step would be engine check but according to your description I guess it's ok and must be excluded as a reason.
Than, we've got two possible reasons - moving part which is out of order or steady part became non-steady.
With lifting options you've got to simulate riding for maybe each moving part.
NB: always be aware how complete is extent of this simulations over real riding conditions. mostly it's about suspension but still important for other parts as well.
checking steady parts might be somehow easy but there still might be need of stand and running engine / wheel and carefulness, accordingly.
also, don't forget about third possibility - foreign object jammed somewhere, e.g. forests use to provide us with such challenges : )
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