Performed system maintenance. Found contactor heavily burnt and pitted. This is a commonly replaced wear and tear part. A heavily burnt and pitted contactor can lead a no cooling situation and worse case scenario cause compressor/ burn out of outdoor equipment. Indoor equipment has heavy rust build up on cabinet and internal parts (Evaporator). Unit also has some growth on supply plenum. This is due to poor insulation value on indoor equipment and connection to cold air supply. Due to over all age condition and refrigerant type suggest replacement. At bare minimum suggest to replace contactor and capacitor on outdoor equipment to prevent break down or serious compressor damage . Capacitor testing 15mfe out 40. This will cause equipment breakdown. Worked completed on JOB 35173421 - tech had customer approve via thier email not sold as do work now. Task codes have been manually added to invoice for revenue intake. Zero'd current task codes to avoid showing on future reports as pending