Fix Sewer line before closing

[Sam D.]

Hello, I was wondering what has been your experience with fixing sewer line. Is this is a major issue OR something that can be addressed easily ?

Brief background about my situation - Home inspector raised a red flag, the 2 second inspector also did the same (I have not seen the report) second inspector was seller sponsored but they have agreed to change the sewer line before closing and I have to bear 50% of the cost. 

Per the sellers contractor - they will "EXCAVATE AND BACKFILL FROM FRONT OF HOME TO THE CURB LINE., REPLACE CAST IRON SEWER WITH 4" PVC PIPE., NO LANDSCAPING OR LAWN RESTORATION".

I am wondering is this good enough or I am missing something ? They are not fixing till the town's main sewer line which is on the road. Per them...that is town's responsibility. Will this be a problem ?

I am trying to close a deal but sewer line has become a major issue. Sellers are extremely difficult to work with and not to mention this is an Estate sale.

Any advise will be greatly appreciated.

Thanks