Well that was a royal pain in the ass, and I'm none the wiser. Couldn't get the heat shield all the way off for two other rivets round the back; and couldn't bend it out of the way properly for pipes going over the top
I've tried to get a decent image of what I did see, so maybe someone can see something?
You can sort of see in the still image and at the start of the video that there's blackening at the far end (closest to the rest of the car); the rest looks like a bit of corrosion here and there but little else.
