Inspection and testing of unit could not recreate noise described by tenant. Test ran system in fan only and in cooling. Tested refrigerant pressures from service ports at indoor coil. Turn on and off unit in different orders to see if noise would happen. Off, then cooling on. Fan only, then cooling on, and multiple shut downs and restarts with no noise or issues found. Suspected that noise could have been fr9m blower motor going from fan only speed to cooling speed but after testing this multiple times, noise was not heard. System is operating in cooling at this time. System not coming in was possibly a 5 minute wait timer built into thermostat to protect the AC system.