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I did close the shut-offs to the kitchen sink but not any other single handled faucets. It didn’t change anything, although the pipes could still have been filled with the “wrong water”.
One of the strangest parts was that the basement toilet, which is T’d off the incoming line, about 1 foot from the pressure reducer, was flushing hot. I can’t possibly figure out how hot water could have made it into that branch of the plumbing. Water has to come IN through the pressure reducer, so how could hot water have made it back that far into the system?
Is it possible that some sort of loss of pressure from the street forced all the cold water pipes to be filled with hot water and until they were drained the cold side ran hot? But how would that explain the hot side being cold?