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Service call that the AC was making a loud noise. Upon arrival spoke with Homeowners about issue. Was informed that there was a partial power loss/Spike earlier and that several appliances were reset. When this occurred the Outdoor Unit was making a very loud noise until it shut off. When it cycled on/off again there were no further issues. Put system in operation to test. Measured Voltages and Amp readings on the system. Checked Electrical Components and measured Refrigerant Charge. System is operating to standards. If the Compressor experienced a power drop/power loss and did not have enough time to stabilize before immediately turning on again it would cause the internal Windings to run improperly and could have caused the loud vibrating noise. No issues with the system were found, and system is operating to standards at this time.