After much troubleshooting, this is the simplest squawk we can get:
AP will occasionally “release” the pitch control. AC might drift down at 100 ft/min. Pilots can gently pull up on the yoke and regain altitude. The yoke is “free”, as in no drag or contercommand from the pitch servo. During this time the autopilot will remain engaged.
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Initial investigation will be
1. Wires from the FGCs to Pitch servo.
2. CWS mode engaging for some reason.
Stick figure for SPZ-8000 CPL
What are the other troubleshooting guidelines for the SPZ-8000 in F900? | toddheffley.com
http://toddheffley.com/wordpress/?p=6540
2nd line has the stick drawing for AFCS 1 2.
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Reading the codes:
This one runs under Libre Office:
SPZ-8000-Flight-Fault-Summary .ods
This one runs under excel: