Portenta Breakout Board Operating Temperature

I want to use Portenta Breakout Board with Portenta H7 module in one of the industrial application projects. But Breakout Board operating temperature range is -15 to 60C. Can you please tell me which component limiting this board to -15C range. Can I use this for the -20C - 70C temperature range? Or do you have any other option at a reasonable cost?

The micro is rated for that temperature range but it more more than just a single component, it is the total design. You can make one from scratch and be sure you source everything for your temperature range. Schematics may be available online.

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