Candy Oven Door

An elderly friend has a Candy double oven (MOD 1F 30M UK No 129535593) - about 7 years old. The top oven door lifts on a sort of spring assisted parallel link mechanism. The spring is a little weaker than we would like and the door will not stay in the raised position without wedging it.
I have taken the door panel off and the springs seem quite powerful and balanced on both sides. (Perhaps I need to drill some lightening holes in the door!!!)
I guess that to access the linkage I will need to remove the oven. I don't want to do this if I will then not be able to make any adjustments. Please - has anyone any advice?



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