I've twisted the wires together that go to the glass switch, so i am certain it is always closed.
Yeah - i've turned soft, i'm originally from Orange in NSW and moving right up north was the best thing i ever did. Mum sent me a photo of snow in Orange the other day - in the middle of the day up here its warm enough to go waterskiing in later July.
But does the switch register during the switch test ? You can close the switch but that does not mean it is working. The two wires that go to the switch are often crushed or stretched from the head being folded. I say this because the switch SEEMS to work during the edge test but not during normal mode (intermittent). Does the audible warning message also occur when the door is open ? I can't remember. But if it does, you should be able to go the mini playfield test with the glass on and obviously the front door open.
The fact it worked for a short time is interesting. I know the mini playfield assembly can be fickle, but I've not heard of it being this unpredictable.