There is a company in Swindon in the UK called F-TEC. They train forklift engineers, normally through apprenticeships I believe but the website would be a starting point.
Hi. Alas, there are no such specialties. You can learn an auto mechanic, and then only experience. I'm self-taught. At the moment, I have reached a very high level in the repair of electric forklift trucks. As well as the repair of electronic controllers and components