It does sound like a fluid or pump issue so we need to start with a service. Here is a guide that will help with this: This video shows the job being done on a similar car but the process is the same.
https://youtu.be/NUOBl4bqtss
and here is a guide to help you step by step with instructions in the diagrams below to show you how on your car.
https://www.2carpros.com/articles/how-to-service-an-automatic-transmission
Below is the process from the manual that will help with this as well. Please let us know if you have other questions. Thanks
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Wednesday, April 21st, 2021 AT 8:58 AM