The technician arrived at the customer's home to investigate a system that intermittently turns on and off, and at times, fails to turn on altogether. The customer had recently replaced the filter and suspected that the system may be low on Freon. The technician activated the system and discovered that it was cycling off due to the low pressure switch. After connecting the gauges, the technician found the pressure to be exceedingly low. The technician informed the customer that there is a leak present, and it is necessary to locate it. We have two options for locating the leak: we can either use nitrogen and soap bubbles or introduce dye along with some refrigerant, then return in 48 hours. However, the customer expressed disinterest in this approach, stating that he has an AC technician who will come to add Freon to the system for $100. The technician then turned off the unit and prepared an estimate, which was subsequently sent to the customer.