Performed the preventive maintenance for the heating season. I checked the amp draw of the blower motor and inducer motor, I made sure that the blower wheel and belt were in good working condition, I took readings of the capacitor to make sure that it was within the manufacturer's recommended tolerance, I looked over the heat exchanger to make sure there were no cracks or holes, I took a temperature split reading and I changed the filters. RTU 4 is missing the draft motor relay so the unit is not operational for heating. RTU 1 & 2 have holes in the heat exchanger and have previously been disabled for heating. Spoke with marianne and the Customer is not interested in repairs at this time.