The main impact of overflow is the effect on the temperature sensor (thermistor) because the electric connection is closest to where the content spills over to board. Typically, the thermistor will read a temperature extremely high (e.g. 70C), typically indicating that there was a spillage.
Rebuilding the parts are really easy. Follow the following link to the tutorial to do that. Though you might need some extra PCBs in order to do so.