Thanks for that link. I'll have a better look at that sometime when it's not 2;00 a.m.
However:
After a quick glance at the first post there, I can say I have read most of that stuff elsewhere already. I'm one of the administrators in this german forum:
https://www.guzzi-forum.de/Forum/
I'll get back to that....
The bloke I bought the Le Mans off had only had it for about half a year, and had been planning to keep it. I know him personally through that forum, and trust what he says. When he bought the bike it was (his words) "in a dismal condition". He put quite a lot of effort into getting the bike back in shape, and I am confident that he went through more or less the same procedure as docc describes there. He only put about 1,000 km. on the bike, so I assume (for now) that it's all good enough to be going on with.
Getting back to the aforementioned german forum: Guzzidiag was developed principally by the forum member Beard (his real name is Bernd), with input from a couple of others from that forum. I've met Beard a couple of times, he's a really nice bloke. Even if I don't get around to having a look at the bike with Guzzidiag myself before then, I expect to be at the Forum Rally at the start of next June. There, Beard and Karsten (under whose name the forum is registered) spend the entire Saturday afternoon looking at people's bikes with Guzzidiag and adjusting what needs to be adjusted.
So I think I've got that pretty much covered.
I'm not an ace mechanic, but I'm dead keen to get into Guzzidiag, and things like keeping an eye on the valve clearances and so on is a matter of course. I"ll be onto it, don't worry.