Quoted from Jesterfunhouse:Could it just be something that got dropped in there during assembly and is not from the boards in your machine? Has anyone ever seen a component just fall out of a board? I would think something would have hit the board to have it drop off and in that case the boards should have an obvious ding. I would think if you lost a capacitor it would exhibit some errors in functionality.
I can't imagine why a cap like that (if it is the entire cap and not just the lid or something) would be anywhere near the cabinet during assembly in order for it to have been dropped in there. More likely it fell off one of the under PF boards during shipping. This definitely can happen with larger surface mount components if there was insufficient solder paste during reflow or it just didn't adhere well for some reason. That being said I don't really know if that type of cap is even on any of the underside boards as I've never looked at them that closely.