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The electrician deemed your problem 'fixed' after that? Do not call him back.
You will want to find out for sure if you have Aluminum wiring. Some circuit breakers have terminals that are made specifically for aluminum. If you replace it, make sure the breaker is the correct type for the wire. If it is Aluminum, you may want to take the wire out of the breaker (shutting off the main power first, obviously) clean it of (sand it) and try the circuit again. If that fixes your problem there are some specific terminal greases out there that are conductive and will keep down the oxidation (try the local H.W. store). Aluminum can build up an oxidation easily if the terminal is loose at all. Otherwise, replacing a single breaker is easy, mostly they just snap in and out.
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