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Motor RPS Failure
F then 51 flashes when there is a motor rotor position sensor (RPS) failure.
he replaced the wrong part, he should've replaced the assembly shown above, this is a big job and I would recommend you attempt yourself, I would call him back and then take the board out and replace the motor rotor position sensor assembly, I don't know why you would replace the board if the error code was 51, hope this helps, thanks, Bryan