$1,000 repair! Tenants admit to messing with A/C electronic board

[Luke H.]

My A/C guy tells me that the electronic board needs to be replaced at a cost of $1,000. That it appears that some wires have been pulled out, disconnected,  severed . The board is located in the attic and about this time last year the tenant admitted to messing with the board when the A/C seemed to malfunction.  I told them not to touch that thing again. It is not covered under warranty.

What would you guys do in this is case?

Thanks