Mine has been great. Yours looks like it has had some tender loving care through the years.
Good advice given can only add a couple ramblings.
There were a couple recalls. One is a throttle return cable added. If done you'll have two cables at the throttle.
The rear wheel was also recalled. A plate was added on the new one to catch spoke nipples if they broke from getting into the rear drive.
https://www.webbikeworld.com/moto-guzzi-recalls/ Have replaced the voltage regulator as previously mentioned and an oil pressure sensor.
Every once in awhile inspect the oil delivery hoses from the cylinder heads to the front of the engine. Had one split on me. Was able to do roadside repair to get home and replaced with newer improved version.
If not mentioned every other blue moon pull the sensor by the right throttle body and wipe off. It's magnetic and runs dry catching small debris off the flywheel.
+1 on Lee's bushings. Have had them on for over 15 yrs. or so.
An old site with some aftermarket part numbers:
http://www.armory.com/~marina/service.html
