Hi MartyJ,
From the video Nicks ball gate definitely appears to open for longer. I have posted some details on another repair I recently carried out which may be related.
http://aussiepinball.com/index.php?topic=2487.0

This may/may not be related to your problem but thought it maybe worth trying. Do you have another driver board you could try in the game? A faulty MPS-U45 transistor could also cause a weird fault.

Hope this helps.

Howdee,

I don't have a spare driver board at this stage but I did test them a while back.  I will pull the board out again to be sure...