Where can I download a manual for a G90m oven

The igniter will glow orange while the oven is on. This is NORMAL. If it went out the burner would not come back on when the thermostat calls for heat .

Have you checked for leaks in the line(s). Yellow would indicate air infiltrating the system.

IF YOU STILL HAVE OWNER'S MANUAL IT WILL HAVE MODEL NUMBER ON IT

Contact manufactures website to request new labels.

Its a good chance its the thermal control board to the fan (PCB),if faulty it doesnt allow fan to reach correct speed thus overheating.
Hope this helps

no not the thermocouple it would not light if it was that , sounds like its the thermostat which should be in the makes hand book underspares .

New electrode or a short on the spark box or electrode out of postion

Usually doors lift off. You may have to dismantle the door to remove the hinges. Take one to a supplier to get the right hinge.

gas man told us that the timer was not linked with oven and this was solved by correcting the clock

Normally they are held on with metal clips at each corner, just pull the seal back and unhook the clips to remove the seal..
Re fit by hooking the clips into the holes in the front of the oven, you will probably have to stretch the seal to get it to fit with it being new.
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Thanks.