MacBook Pro Key Replacement

I have the newest MacBook Pro without the touch bar. As soon as I began to use the laptop after purchasing(Aug.26th) I noticed the I had to press excessively hard on the H key for it to input. I brought it to the Apple Store(Sept.20th) where they only checked for debris under the laptop and told me it should work fine now. Now the key cap will not stay in place and when I look underneath it the white plastic piece(butterfly mechanism) has broken hinges. I have AppleCare+ and am still under the warranty. Will I expect to have to pay a heavy price when I bring it back to the Apple Store?