David, Chris, they are serviceable but they need to be taken apart cleaned and reassembled. I did it to mine. I had to jb weld the cover back on to make a tight seal. If I'm not mistaken, the wire that you got a connection with at 40% is the kick down circuit and is supposed to kick in at a part open throttle position. If either of you would like, I will try and service yours as I did mine at no charge, but no guarantees also. arnulfo