I was working on a split system two and one half ton. Carrier 38tra030 approx 12 years old. The complaint was at night it gets cool but during the day the temperature goes up. Here are the pressures I found, hp195 bp 75 sution temp 46 deg, outdoor temp. 90 deg. The system has an accurator on it. My superheat is 2 deg. I thought perhaps the system was overcharged. Recovered approx 2 pounds. No change. The discharge air was 70 deg. The room temp was 77deg. Checked the indoor coil and duct work in the attic. The coil was clean and the duct work was all attached and insulated. Need some suggestions.Could it possibly be bad discharge valves on the compressor? Thanking you in advance.