No cooling on unit number four. Did a complete evaluation of system. Found system low on refrigerant which means there’s a leak in the system, also system has a weak outdoor capacitor, contactor is burnt and pitted, and compressor has high startup amps. Gave client Solutions for issues with the system, however, system is 12 years old and recommend replacing due to age and cost of repairs. Client pay the diagnostic fee and would like to think about replacement options over the next day or so and will get back to us.