Damaged fatbottom 4x12

So this isn’t fryette’s problem because it’s a used cab but maybe I could get some advice on how to handle it or if there’s anything I could do.

Anyway, I just bought a used FatBottom 4x12. After opening the cab up to tighten a loose jack I found the the MDF back panel has a large crack and at moderate volumes it’s causing buzzing and rumbling.

Is there anyway to repair this, maybe someone at fryette has some ideas on how it could possibly be fixed or maybe even where I could get it fixed if that’s even possible? Any help or advice is greatly appreciated.