Upon arrival, customer mentioned that the condenser makes really loud grinding noise every time it goes on and off, I inspect everything starting from the wires, mechanical part refrigerant charge, and then find any issues the conclusion that the noise is most likely coming from the metal panels. Every time unit kicks in and makes vibration, I gaskets some of the screws to eliminate the noise, Refrigerator and over operation of the system and confirmed that the unit is working at top performance.