Hasselblad 503cxi body foam crumbling

Hasselblad cxi body: I have discovered that the foam walls inside the body are cracking, and crumbling away. I have found info on replacing foam in the film magazines but this is inside the body. If I could replace this myself I would give it a go. I am in Bali Indonesia but sometimes visit Perth West Australia. Any help would be appreciated.
Cheers, Elvis