Yeah, they leave out transmission malfunction in that troubleshooting guide. I just opened mine up and the pin holding the spring in place to engage the gears had snapped in half. The new assembly is somewhere around $70-$100, but if they had a exploded diagram of the parts inside the transmission, I could probably buy said pin for $2. I'm guessing they don't want folks to fix their own equipment. If anyone knows of a place to find individual parts for their transmissions, I'd love to find out about it.