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Apple IIGS Monitor repair


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Need some advice on some IIGS monitors that have various problems around focus and brightness. Generally as they warm up the brightness and/or focus changes. The worst one is pictured below and that is the best picture I got after adjusting the flyback focus to the max. Note the degauss function on this screen is not working.

 

What I'm trying to determine is if these type of faults are related to the flyblack transformer and if so how I can go about confirming this.

 

 

y5gnrjL.jpg

 

 

 

 

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I've had a quick look at ESR readings of key caps and they seem fine however it's probably something I need to look more carefully including checking capacitance. Just seeing if I can rule out the flyback given there is no replacement available.

 

Does anyone know if there is a test point for B+

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