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Don't forget about the voltage drop across the diodes. I am not an EE mojor, but I have read that there is a 0.7v loss from the average diode. The transistors that run the motor loose about 0.2v each. I think a better way to do it is to find the power leads to the PNP transistors (and their pullup resistors), cut those leads, and run your 3v to them.
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