09-11-2012, 02:06 PM
In that case, Andrew, seems to me that the wire to the grid connection has fallen off or has been removed. As you imply, a closer 'eye-ball' exam. hopefully will throw some light on this. And who knows? You might see the problem - if you are endowed, that is, with a pair of Magic Eyes!
Heaven only knows, I wish I was! 
Al.


Al.