The customer said upstairs condenser was making a loud rattling noise. Noise is not present anymore after I turned on the system. Tested system and found pitted main electrical switch and txv not operating properly. Pressures are 57.9 and 191.8 with a superheat of 26.6 and a subcooling of 18.9. Factory specs call for a subcooling of 9 degrees. Saturation temperature at 31.9 degrees (freezing).Supply temperature is at 55 degrees with the indoor temperature at 76 degrees. Due to age and cost of repairs of a/c system, recommend upgrading system. Replaced uv bulb for upstairs apco. The customer wants to discuss options with the husband.