Sewer Scope Findings- Advice please

[Rahnesha White]

I have my first property under contract and I did inspections and the sewer scope results are as follows. I don't know if this is considered a red flag for closing on this property and or if I should try to negotiate with the seller for concessions OR if this just the plumber being overly cautious since the pipes are technically draining. Due diligence technically ends today so any advice is appreciated thank you! 

"Put camera in sewer Sewer pipe is aprox. 85 feet long and the first 75 feet of the sewer is
PVC, which indicates that the sewer has been replaced up to 75 feet.
There is a belly at 20 feet where pipe goes down then back up
At 75 feet the pipe is shifted (most like due to improper bedding.). The new pipe settled lower than the old pipe that it was attached to.
At this point sewer is draining and working but will most likely have problems in the future.

To replace shift near the tap aprox. $6,500.00"