hi, my wifes old henry hoover started to smoke this morning accompanied by a burning smell. anyway i dismantled henry and found the problem was related to the red 2 square pin socket which is next to the on/off rocker switch. i traced the wiring back and found that the socket is 'piggy-backed' to the on/off switch so removed it as we've never used it, henry is now working fine so my question is what is the purpose of this 2 pin socket? anyone enlighten me?