I purchased a Repair Operation Manual for my Land Rover. This is different from the owner’s manual. “The purpose of this manual is to assist skilled mechanics in the efficient repair and maintenance of the range of vehicles given on the title-page.” (Series III)
Land Rover owners insist these trucks are so simple, so basic, that any good auto mechanic can service and repair them. But the truck is 38 years old and having the factory manual can’t hurt. It was pricey but a good investment.