Century IIB autopilot troubleshooting

should those test similar to the power transistors, like double diodes?
 
What about for a century 1 installation? The unit biases all the way left when turned on. It can be controlled and rolled all the way right with the roll knob. The trim adjuster has been swept all the way to the right without any effect for the immediate left roll when turned on. The plane can be leveled by turning the adjuster right in low sensitivity mode.
 
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