1 - Condition of continued employment.
I know that seems self-evident and not the answer of actually having the guys pick up their quality levels, but if there is an on-going (as in daily or weekly) issue with a tech they just have to go. You can't afford to have them working with you. If it is a once in a great while (less than monthly) then we progress on. In any case, have your in-shop comeback log and give the technician notification everytime an apparent comeback occurs.
2 - Allow the technician every opportunity to explain why it isn't his/her responsibility. Sometimes all evidence on the first repair pointed to solution X - if that is what the shop manual says to do, then that is what they should do.
3 - Ask the tech, frankly, how you can ask the customer or factory for more money for this issue given that they either broke additional parts or missed the boat on the first diagnosis. They work for free, I'll try to cover the parts.
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** Rob, Editor Dealersedge/WD&S **Help is only a message post away!
robc@dealersedge.com