Visually check the speaker.
If the surrounding foam is damaged, you can repair it with this kit:
https://www.ebay.com/itm/2-6-5-Butyl...0AAOSwCU1YtyvX
Otherwise, replace both door speakers with a matching pair of your choice.

If making the repair, probably best to repair all 4 speakers (doors and subwoofers).
That's what I had to do...