Engineered hardwood floors and water
Unfortunately engineered hardwood floors do not do well with exposure to water. Without seeing pictures it is hard to say for certain but it is likely that some sections of the floor are permanently damaged. However if you can find flooring that exactly matches what is there then it should not be necessary to replace it all. However, that may not be possible, especially if the floor is aged. In this case you may have to pay for the floor to be replaced. If that does happen make sure they do not charge you for a better quality floor than what is already there.
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http://www.jgpwoodfloors.com/floor-types/engineered.htm
Unfortunately engineered hardwood floors do not do well with exposure to water. Without seeing pictures it is hard to say for certain but it is likely that some sections of the floor are permanently damaged. However if you can find flooring that exactly matches what is there then it should not be necessary to replace it all. However, that may not be possible, especially if the floor is aged. In this case you may have to pay for the floor to be replaced. If that does happen make sure they do not charge you for a better quality floor than what is already there.
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http://www.jgpwoodfloors.com/floor-types/engineered.htm