Interesting as every one I've seen is built like the picture posted - including the MY98 I've looked at.
It's possible, not sure how likely, the plastic enclosure melted around the speaker frame (would take an extremely high temp though).
Ok, go to plan B and pull the whole pod out. It's held in w/ only 4 torx screws in the corners (green arrows below). Can't imagine it's open in the back as that would defeat the entire purpose but take a look. At the very least, you'll have it removed to make it easier to work on and see what's holding it up.
Also, try and post a pix of what you have as it would help.