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I just had two of the units apart today.
My advice would be to not mess with the motor - if it is drawing too much current, or is seized get a new one from the junkyard. The motor and solenoid can be tested easily (12v across pins 4 and 5 for the motor, vice versa to reverse - 12v across pins 6 and 7 for the solenoid)
Those traces have a resistive value, so resoldering them or cleaning them with sandpaper would be a bad idea.
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