Your employees are salespeople first, technicians second -- so train them that way.
When you invest in training -- and that is what it is, an investment -- you expect a return for what you spent. That's why it is easy for any service and repair business owner to justify spending some of their profits on training technicians to be better technicians.
It is important for them to be familiar with the latest technology, as well as the newest and most sophisticated equipment that any of your customers may have. Trained technicians do a better job, avoid callbacks and can accomplish the work faster than untrained people. It's a no-brainer to spend the money. Customers are happier and you can generate more revenue with fewer headaches than having less professional technicians.