At the end of last year I had to have the software updated on a precision piece of equipment for work, it was something I was not willing to do myself as it also required some safety checks to be undertaken afterwards.
Before sending the item to the manufacturer part of the procedure was filling in a generic repair request form online. One of the questions was: “Have you already attempted a repair yourself?”, followed by: “If so, what did you do?”. I can only assume this had a direct effect on the amount they charged the customer!