I completed a diagnostic. Here for a 12 year old air conditioner that is not working properly. Customer explained to me that she keeps thermostat set on 72° in lately it has not been running below 74. I explained to her that with extreme temperatures lately it is going to be harder to reach certain temperatures. Explained the general rule of approximately 20° lower inside than the outdoor temperature. Checked capacitor and found it slightly low on the compressor side so went ahead and replaced this at customers request. Superheat is 13 degrees. System is running on my departure.