I'd ask for $20k and see how they respond @Michael BoyleEven with the seller credit, you'll still have to pay out of pocket for the repair...so maybe consider a backup plan...I'd rather have cash than the credit...have the seller take the full proceeds and write you a check for $10k at closing...good luck! 

You can only get back up to the original purchase price if the property is now worth more. 

The timelines allow for enough research but when little things come up you have to act quickly to over come them due to the time lines of a 1031.Inventory is going to be hit or miss... you might spend a lot of effort to come up with a plan but you don't control inventory so have backups.

Secondly,  it wasn’t a whole lot of extra work and I have a back up person to go to to collect rent if needed.

Maybe back up a step - what is your goal on this property?  

Maybe back up a bit to look at the options.1. 

Real Estate Investing has given me the opportunity to quit my day job, create passive income, and free a lot of my time back up to be able to do what I love.However, with each new "level" of success brings on new challenges and hurdles along with that stage of the business.I am curious to know: What is the #1 Struggle in Your Real Estate Business Today?

I have a rental property here in DFW that had sewer backups several times in a row about 6 months ago. 

The wall would need to come down and be put back up costing me around $8k, which I don't want to spend.

Remember a couple of days ago I asked about the tenant who is saying she doesn't have to pay rent because of a sewage backup?