Timing chain replaced at 35000. Now I need to replace again at 74490. Why

The first time they said it had to be replaced, and now they want to replace again. When I am driving I hear the rattling sound. Its the dealer that fixed it the first time and now want to do it again.

get other opinions!like i said in the first answer.timing chain vehicles,90% of them will go to the scrap yard and chains still a going!dealer sometimes have FORKED-TONGUE!!!you may have a heat shield rattling,a cover rattling,or something else.i would take it to a trusted repair shop/shops,for other opinions.