In 2003, I had a choice of buying a used Fujitsu or used Thinkpad since I needed it for my sysadmin activity. The prices were comparable. I have found a Thinkpad service manual. I have found nothing about the Fujitsu. So I asked Fujitsu service about any docs. Answer was formulated very politely and was the following:
1) We disclose NO service info, it's a commercial secret, we are very-very sorry.
2) This specific book is a Japan-specific model. It's not sold outside Japan, we are very-very sorry. We can supply you with an user manual but it's in Japanese and in printed form, you should pay for it in Yens, we are very-very sorry.
3) No, we shall NOT tell you what is the model of similar model for the US market, it's a commercial secret, we are very-very sorry.
I answered that I am a sysadmin in some org of 2000 persons of staff and I'll prefer IBM for all this staff and I am very-very sorry.
So I am very-very sorry but my choice is IBM and Lenovo and shall be while service manuals are available (Which means that I am not a fanatic and if/when Lenovo stops supplying the service manuals I shall migrate to other supplier immediately)