The service department is a much misunderstood group of highly skilled prefessionals. One of these days they will get the appreication they deserve but in the meantime we need to continue to raise the bar on their performance and image.
One of the methods we could use would be to track quality. each week that goes by with a 100% quality record should be noted and celebrated. I am not sure you truly understand that the work that is done is exceptionally high quality and the service warranty or employee redo levels are extremely low. Start to track it and publish it. Just like a safety record put it on the wall. Keep a running total of the number of weeks without a quality failure. You will be pleased when you see the results as the number will keep going higher and higher. The time is now.