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I acquired a Spectrum 375 X-Treme from an individual via trade. The unit wouldn't power on when plugged in. He thinks it could be circuit board but unsure. The serial # is: LH190210P. I pulled cover off to see if anything looks abnormal, burned, etc. Circuit board # is 231538B that is in it currently. New board # is: 245138 and around $900. I hate to replace board on speculation. Is there a good way to troubleshoot the unit from a private owner's perspective. Are the boards common for failure? Is it worth anything in non working condition? It is not beat up. But if board, might as well buy new unit. Any advice would be great.