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Hello, thank you for your question. The "3" at the end of your microwave's model number indicates manufacturing information. When the model is manufactured, these extra letters/numbers are placed on the appliance rating plate and product registration card. These letters/numbers are used to identify manufacturing specific data when the appliance is made. Should service or parts be needed, these are used as identifiers for the specific appliance. Therefore, the PEB7227AN3DD that you own and the PEB7227ANDD are the same model and will be a direct replacement. We hope this helps! Please feel free to reach out with any further questions you may have. -Chris@GEA
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