Tech arrived at a Free inspection. Upon arrival the customer mentioned that she had a company out that had said she had holes in the heat exchanger. She wanted wished to get pricing on repairs and replacement. The system was evaluated first in cooling. The refrigerant was low. A leak search was performed and a leak was found at the evaporator coil (refer to video). The disconnect plug was removed for the leak search and reinserted afterwards. During reinsertion, the surge protector lights flickered asnd went out. This inhibited the unit from recieving voltage from that point. The surge protector will need to be replaced or bypassed to fully evaluate the system. There was excessive rust around and below the heat exchanger connections. The burner compartment was full of rust. The evaporator coil was rusted and corroded. The tech gave rough estimates for the coil and heat exchanger, as well as a starting price for a a 5 ton gas package unit. The customer would like more exact pricing