Where are the power vent really and the indoor blower relays located in the Goodman GMP100-3 furnace. According to the repairman these needs to be replaced because the contacts may be bad

On the main control board. In the bottom door of the unit. Never seen one stop sending power out to the vent motor, and the blower motor at the same time. In less thise board got wet and was shorted out by water.