Dave,
Thanks for the heads up in the prechamber that holds upper and lower body’s, we will take a look in ours since recently we had one similar situation , Also as Mark is mentioning, we have had either broken or loose bolts in the piece that holds the PCC valve in the Yokes, we added in our 1k hours the inspection of these bolts, just inspection not to double tight since they are loctite “supposedly” torqued. We have been able to identify more loose bolts were we have to add loctite and torque them as Wartsila specs.