Peter - You took the display board (MDB) from the Gorgar and placed it in the Time Warp and the display has the same issue ?

Looking at that picture of the MDB - you can see the "e" segment resistor is cooked. That will be your problem. (Fifth resistor across the top - 3 smaller ones, one large, then your cooked segment resistor)

From memory - 10K ohm 1/2 watt - Should be available from Jaycar / Dick Smith. I don't have the schematics at hand to confirm, but a multimeter set to OHMs will confirm.