Repair 533E Grafic Eq Symetrix

[Dirk Bpmix]

Looking for a service guide for the 533E Grafic EQ build by Symetrix.The board with the filters on it has a label 531E Rev E. The manual find on the website Symetrix is not the right one, Input buffer is on my noard U1 , website U2. I miss also information on the board with the potentiometers on it.
Thanks