Damaged Stair Replaced up to Current Code?

I am currently dealing with a fire station that was constructed in 1965, prior to any adopted building codes in Indiana.

The fire station suffered structural and roof damage during a storm from a tree fall. My question is an exterior exit staircase from the second floor was damaged. A structural engineer assessed the staircase and addressed the items needing repaired, which is quite extensive and will need to be removed for repair. The staircase is far from meeting current code.

The insurance company does not want to pay for a new exterior stairway that would meet code, they want to have it repaired.

Is there any code requirement in the 2012 IBC that would require this stairway to be brought up to the 2012 IBC on an existing building?

The stairway is the original. I cannot for the life of me find a code section that would require this stairway to be code compliant if removed and repaired. If we can cite a code requirement for this to be code compliant the insurance will pay for a brand new stairway, which is our goal.

Any recommendations or prior experience with this type of situation would be greatly appreciated! (You would think the insurance would want a code compliant exit component, but I know its all about the $$$)

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