2006 Opel Astra Car Alarms

Computer problem
2006 Opel Astra 4 cyl Front Wheel Drive Automatic

I have two alarms, comes and go randum, some times stay for hours, and some times gone for days. One of them concerned with ABS brake the second alarms concerned with fult in the electoronics. Please be note that both alarms does not effect in the car performance.
Also I would like to down load repair and parts manuals for the obove oplel.
Your reply to explaine and help me to solve this problem will be haighly apricited.
Regards.