Repairing Exposed Aggregate Pre-Cast Concrete Panels

Indianapolis area
I too have a panel that is damaged. The damaged area is 3’x4’ at 2" thick.
The building is 10+ years and I have no idea who to contact for panel sections.
Ideally I would love to be able to buy a prefab slab ( 4’x4’x2") and then cut to fit my application
Any thoughts would be appreciated ( randy.craw@gmail.com)