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Diagnose Issues on my 2015 S

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Hi All,

My higher mileage April 2015 Model S is having issues and I'd like to know what options I have to at least attempt to diagnose the problems myself. I understand where the FakraHSD and CAN Bus ports are and how to get to them. With the HSD I believe you need to access Tesla Toolbox software which is expensive at $333 a month. Any other options for that setup of hardware with a laptop. What about the CAN Bus port? What hardware is ideal to use with that and what diagnostic data will it show compared to the HSD with the Toolbox?

Thanks in advance!

-Al