It could be worse Weisan Pal.
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http://www.mercurynews.com/2017/03/2...sue-developer/ "
Having been in construction for over 30 years and having repaired, replaced leaking/broken sewer pipes myself the cheapest solution is to having it fixed yourself and try to seek a compromise with both the plumber and foundation company to chip in rather than going to court. Maybe they'll be amenable to that rather than face possible court action?