Hint for having wierd resonance ....

Recently i noticed a very odd resonance on my X and i could find it and i went through replacing all bearing stacks and the X rails but still had this odd resonance (see picture) When i was listning during a resonance measurement i notice an odd sound coming from the Eva part cooling duct and decided to take that off for inspection ....... Well noticed the wall was not supported anymore and broke where the circle is. Just as hint / tip for all here if you run into similar issue and cant piont what it is, it might be worth to check that part and save yourself searching for hours.