If so did you tunnel under the slab and replace the cast iron with PVC, Jack hammer the concrete up and replace the pipe, or send a sleeve or liner down the pipe to coat it?

That is figured by deducting from the Replacement Cost (RC) for the depreciation.  

While he still kicks it back to a specialist when dealing with clients, he tells me exactly what we're looking at as far as costs and difficulty to repair / replace.  

What you need to do is make sure your replacement properties are equal or greater than the sold properties in purchase price and basis including depreciation.

The challenge comes in the case of a 1031 exchange when you only have 45 days to identify a replacement property and 6 months to close. 

You need to look around... most big-box stores and larger window replacement companies offer free installation. 

There's no cleaner app that replaces the relationship you develop with a trusted reliable cleaner/cleaning company and their local handyman contacts.

I got a mailer from NRIA.org offering siding/roofing/ window etc. replacement under government grants.

Although I wonder from cost & work perspective, is that better/cheaper to do vs demolishing the existing shed and rebuild properly or replacing with a prefab unit (from Home Depot, etc.) after the demolition.

From an insurance standpoint, if your policy was based on Replacement Cost, the company will likely just pay based on the Actual Cash Value (Replacement minus depreciation).