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I think it could be your thermostat. The thermostat tells the compressor when to run and when to cut off. It could be as simple as a misaligned pointer...pointer may be set at 72 and the thermostat just cuts off before the desired temp is acquired. I would check the actual temperature with a seperate thermometer and find out where the thermostat must be set to obtain the desired temperature.
You may be able to adjust the thermostat to reflect the actual temperature, or you might have to replace the thermostat.
Just my $.02 worth,
John |