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=2487.0This 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.
