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Replacing a riser is far from always needed https://pomplumbing.ca/riser-and-zone-valves-replacement/ , but to determine exactly whether there is such a need, you need to call in professionals. They will inspect the pipes with special devices and tell you if they need to be replaced or if they can get by with little bloodshed, that is, repairs. I recently completely changed all the pipes and I hope not to climb into them in the next thirty years.