Found the 12 small bearings in the bottom of the pan this weekend ,also abit of surprise was the surrounding cage (made of plastic) for the bearings (that was missing )was found wedged in the screen that sumps the oil for delivery to the engine.The plastic cage was mostly still in its orig placement in the assembly ,seems just the walls of the cage let go when the bearings seized ,this was evident due to some of the plastic stuck to some of the bearings,HOT.The vacuum pumps bearing seems to be designed this way ,the plastic is pretty harmless to the chain assembly,the bearings are also pretty tiny but would not be able to pass up into the motor thru the pickup sceen.If the right conditions were in place Im sure several bearings could mess with the chain but this kind of failure of the bearing was minimial to non existant in my case.The real harm to an engine with these vacuum pumps and their failure is when the armature breaks which is A 1 INCH of hardened steel with other shrapnel falling into the chain area.