Mazda CX-7 rattle with a little tap on gas pedal

Hi all, have a 2007 CX-7 with 219xxxkms regularly serviced car, runs good as it should, no transmission issues or anything…Have this slight rattle that only happens at idle and low speeds when you tap the gas lightly. Hoping it is not vvt timing chain. Any help would be good, thanks!
 

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