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I have one of these units where the motor drive release pin assembly part number 0-02086 and 0-02087 has locked in the up position. The pin, when in the up position, automatically depresses the shutter release button when you attach the motor drive to the body. This is an interlock that when locked in the up position prevents release and firing of the motor drive unit. I have spoken with Eric Hendrickson and he won't touch these units and has no parts for them as well. Does anyone know of a repair source for these units or better yet does anyone know where the repair manual (not the parts list and exploded views of the motor drive which I have) that includes trouble shooting these units might be found? Thanks for any help you may be able to provide!