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Could just be the hot engine parts contracting at different rates due to them being made from different materials (cast aluminum vs. steel or cast iron, etc.) causing the tinking sound.
 
I've noticed my 2010 Pat makes some odd noises after I shut it off and remove the key. Little clicks from behind the dash. I have to assume that it's just the various circuits shutting down. These modern vehicles are becoming more & more complicated every year. I swear that someday they'll even replace the engine with some sort of solid state device.
 
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