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Update.
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Concrete has not changed much. I've held off finishing off the yard because of potential access for the concrete truck and the extra foot traffic. PB thought he would try to power wash a portion, which of course did not work but I think he needed to see that for himself. Total deck area is approximately 1200 sq. ft. Area affected by discoloration 540 sq. ft. At one point the PB said it would cost him approximately $10 a sq. ft. to tear out and replace. He also had a spray coat(single color) quote for 5.85 a sq. ft.
He offered two options:
1)Tear out, this would include three sets of steps.
2)Spray coating the entire surface area.
I also countered with: 3)Leave as is and negotiate a discount which he is open too.
So this weekend my wife and I will decide which of the three options to go with.
Items for my wife and I to consider.
If we pour and replace I have not idea or control on the timing.
The person replacing the concrete would be the same contractor who did it originally.
I am in the process of finding out what material is being offered for the 'spray'. It too would be done by the same contractor. I am not comfortable with his experience on applying the application.
If we do a tear out, there is no guarantee that the new will match the old, so we may have a new problem with a glaring mismatch
We are fairly certain we will go options 1 or 3 tear out or leave as is with price discount.
Do we risk color mismatch with almost half being a different color?
Do we leave as is, with furniture and planters mixed in to break up the appearance?
Here is a current photo(fun times): The bottom of the picture shows the concrete.
Here is a second shot more full on: