Why is part of a circuit without power after an applicance short?
The sad part is your electrician should have figured this out and properly repaired in a very short time line. It may be dangerous to properly repair the circuit now that it has been re fed from another location (and possibly from a different leg) causing a dangerous situation for a future repair, remodel. 
The proper way would have been to go to the last working outlet and check the connections then the first non working outlet these 2 locations are where 99% of these type of electrical failures are located when the breaker has not tripped and there are additional working outlets on the same breaker.
Usually I find a loose back stabb. But sometimes a broken wire at a wire nut or screw terminal.  If you do go back and repair this make sure the second feed from the main panel is removed.