Manufacturer Carrier Model # CH14NB060P0GAAAA Serial # 4120X48092 Completed a preventative maintenance on a carrier air conditioner. Temperature split was 20. Customer changed 20x25x4 filter. Performed a amperage readings on the compressor and condenser fan motor both are operating properly. Cleaned out drain line also made sure evaporator coil was draining. System is operating properly. Customer has a failed expansion tank. See estimate for details. Remaining Balance 299.35 system is operating properly at this time.