[BrianG]

Hmm, you might have damaged the PCB or something with the impact, although you'd think the MM would be a little more durable than that. I'd check for any cracks near where the throttle cable is soldered on. I did notice that the edge of the external case is pretty close to the PCB and on a hard impact, the force could have done something to the PCB in that area. Also, I'd remove the MM from the case and inspect elsewhere...