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I would suspect a motor fault, most likely an insulation problem in the armature or the fields. Contact Vitamix for your local authorised service agent. Unless it has been assembled incorrectly it should not be one of the internal wires as they are supposed to be secured and correctly routed during assembly.
It will probably just need the pot replacing, take note of where the wires go. I see someone else here is doing the same job and wants to know where to put them back. Take a photo first saves a lot of grief. The pot is the rotary resistance switch behind the knob.
The hex wrench only fits in one position, there is a groove in the lip in the top housing and you need to turn the coupling until the hex screw head lines up. The groove is normally plugged with a dob of white silicone. The hex screw is not tightened fully tight on reassembly, the coupling needs a bit of slop. Speed control problem will likely involve replacing the control switch assembly.
Some models had a weakness with the variable resistance in the rotary switch but your description sounds more like the main PCB or even the motor both of which are very expensive parts to replace.
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