Good morning, Wayne.

 JP>   and gently rub the contacts clean.  Works for me.

 WC> Hm, never occured to me but it's a no lose situation and
 WC> I do have three perfect units to fall back on.

  It is said that these contacs are gold plated to ensure that there will be
  no corrosion but the eraser use has been beneficial here. Try it.

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