I think people obtain certain service manuals with a lot of difficulty sometimes, and they don't want to just give that information up, otherwise anyone could look up a veng chart to fix something, and kill themselves.
I spent many years replacing the field sync chip in many RM monitors, and at best, it was 50/50 whether this cured the fault. The chip had a huge heatsync attached to it, as part of it's design, and unsoldering this caused damage.
A chance phonecall to the right person in TS, offered a better solution, that you connect various test points together, and recalibrate a pot.
But you have to recalibrate the pot when the monitor is switched on, and very close to the HT lead...so if service manuals were public domain, many could be killed. But all in, this factory setup method worked 100%, where replacing chips didn't.
I bought a service manual for over £50 for a certain monitor, but someone managed to snap the tube base off it..£50 down..do I want to give free info when I forked out £50?
The worst is I have a Microvitec boxy BBC monitor, that is dead, and I spent YEARS fixing these, but now I don't have the service manual, and am stumped as to the fault.
It's good to share info, but only in the right hands.