My wife made an error in the kitchen this evening. She used a dairy stainless steel pot to boil potatoes that were cut with parve knives. Afterwards, she somehow forgot it was a dairy pot and used meat utensils in it. Specifically, a meat stainless steel fork was used to stir the potatoes while boiling, a stainless steel strainer from our meat set was used to stain the water in the sink, and then a stainless steel potato masher (with plastic handle) was used to mash them. All the utensils, except the fork, were washed by hand and put away before the error was realized.
What is the status on the pot, fork, strainer, and masher? Is there a need to kasher them?