Symptoms: Safe and full auto fire modes work as they should. On semi-auto, the AEG fires full auto. The selector plate is moving normally and engaging the cutoff lever correctly, and the cutoff lever spring is in place.
Diagnosis: Inspection of the cutoff lever revealed that the arm of the cutoff lever which engages the sector gear had worn down. The damage was subtle but apparent when compared to a normal cutoff lever. I've highlighted the damaged area in the photo below. You can see that the entire surface of the arm is worn, and the indicated corner has been rubbed down and no longer catches the sector as it should.
As with the previous quick fix, replacing the part in question will solve this one. In this case the lever failed more quickly than normal because the sector gear was shimmed too tightly against it. Hopefully this saves someone else time on diagnosis!
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