Linkwitz-Riley 2-way electronic crossover modification

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Hi!
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I have this crossover and I would like to change the original crossover frequency from 2200Hz to ca.220Hz.
Unfortunately I can not get any stuffing diagram or component diagram for this XO and I can not identificat - recognize the resistors to be replaced on the board. I can calculate the needed resistor values. I would need help to locate them on the board.
Has anybody any info about this panel?
BTW: all the caps are 3.3nF

Greets:
Tyimo
 

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