Today I arrived in La Grange and evaluated the customers concerns. Communicating system was completely operational with no active alarms or faults within the system, and it passed the refrigerant charging sequence. I contacted Daryl and he recommended that I reach out to Russell from tech, Russell tech-support Stated when the system ambient temperatures of 109 like yesterday, it is not going to keep up. Also verified all the data I had compiled through various tests. On the Mitsubishi system, I low pressures with customers approval. I added 2 pounds of refrigerant and then I performed a leak search. I found the indoor evaporator coil leaking refrigerant, Moving forward, I am awaiting pricing and availability from the manufacturer and will be calling the customer back once I receive it.