Westone Spectrum Series II SPB311 bass wiring

This is the wiring diagram for my SPB311. I presume it is a 1988 model as it has 24 frets and a beveled heel.

The IC (GL358 dual operational amplifier) on the PCB is an obsolete part and may be hard or costly to obtain - if it needs replaced, an LM358 may be used instead.

Notes - Only these wires are shown in the same colour as they are on the guitar :

I have used different colours for all the other wires to make the diagram readable - on the guitar, they are all dark blue.