Is there any documentation on what could be a fault in the equipment, how to define and how to fix them?

what I found:
http://download.routerboard.pl/Eth.port_testing.pdf
http://download.routerboard.pl/RB450G.pdf
http://download.routerboard.pl/RB450.pdf

Just interisuet what resistance should be transmitting cable in Gigabit interfaces?

Yes such documents exist for most products. Distributrors have access to them. Which product do you have and what is the problem?

I work in a company which is a distributor of Mikrotik equipment. How can I get all the possible documentation of all the possible malfunction of equipment Mikrotik?

I got the 450G, in his first port of high-RESISTANCE: 440kOm between orange and green and white wire. wanted to know what you can do to try to restore it?

found on the documentation

Yes such documents exist for most products. Distributrors have access to them. Which product do you have and what is the problem?

in india, the distributor, dont even give warranty for mikrotik, they simply said mikrotik dont give warranty for us.

Make sure you buy from official distributor, to receive warranty service:
http://www.mikrotik.com/buy/asia/india

xxxxx

Make sure you buy from official distributor, to receive warranty service:
http://www.mikrotik.com/buy/asia/india

i buyed from brijj,tara,rah infotech no one gives warranty, multilink gives warranty for extra charge but it is only manfacture defects at the time of purchase not for a year.

Have you tried asking if sellers from other countries ship to India? I know distributors from Poland ship around the world. Probably many other countries too. You can choose the seller whom you like the most, and who gives you the best service.