According to ASME B31.3 paragraph 328.6 that is mentioned for repairing: “Preheating and heat treatment shall be as required for the original welding. See also paragraph 341.3.3.”
Therefore, after NDT, which is done after PWHT, if there is a repair, PWHT shall be repeated. You don’t need to cut out the joint. Just do another PWHT on it.