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Do you know how many outlets are on the affected circuit?
Have you unplugged everything from all of the outlets?
I would start by trying to remove all items that plug in from the circuit. Then, I would check any GFI outlets on the circuit. Since two of the outlets on the circuit are in bathrooms, they should be GFI protected. That is done with either a GFI breaker, or a GFI outlet. GFI outlets, particularly, have been known to short out internally, causing the breaker to trip until the outlet is replaced.
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