Light switch, open circuit issue?

I came home two weeks ago to find power out in a section of my house. The breaker had flipped in the basement. I pushed it back to "on" and it kicked right back along with a loud buzzing noise in the wall. A contractor friend came over and diagnosed the issue to be an "open circuit" caused by... show more I came home two weeks ago to find power out in a section of my house. The breaker had flipped in the basement. I pushed it back to "on" and it kicked right back along with a loud buzzing noise in the wall. A contractor friend came over and diagnosed the issue to be an "open circuit" caused by a foyer light and recommended that I replace the two switches that control this light. I have since replaced the two 3-way switches and still have the same issue. When I flip the switch I hear a buzz and that power kicks off.

any thoughts or advice on how to repair this issue?
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