Swing arm failure points
Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models
It is highly unlikedly to experience a swing arm failure. However, Gerhard Ziesemann experienced a failure and sent me a brief description and photos. In Gerhard's own words:
The pics attached show the broken rear swingarm of my own V7 700 at approx. 180000 km (nearly half of that with a sidecar attached). I put a lamp in to make the damage visible.