Tedelex PSU debug

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Hey there busy pirating parts from an old tedelex amp, I want to take some of the modules inside but can not quite work out the voltages needed to drive them... I have mapped out the psu as best I could... takes quite a bit of concentration traceing all those traces (lol).

Can someone tell me what the voltages at x and Y will be?
Erm, please!

the zeners are marked 880X
 

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