I took the warning about the chip to heart and was very cautious when trying to remove it, which lead to me failing to remove it! I think this may need a special tool, doing it with a small screwdriver didnt seem to budge it without risking damage so I left it alone. I've checked the seating of the other chip and rechecked all the solder joints and then I powered it back up.
When the power was reapplied, the full display came on again, every element lit. With it powered I carefully used the non-conductive end of a small screwdriver and tapped it all over the place to see if there may be a loose connection, no affect. I wiggled the display board around in it's socket too, also no affect, well other than a little shock when touching the wrong part of the board!
So I'm pretty much at a loss, a bit disappointed too
Where can I go from here? Is there any sort of "get-you-working" service available? Can I send the whole thing back at all?