My favorite repair is one that was diagnosed as a worst case scenario by another shop and when it comes to me I do proper diagnostic and find out that it is actually a simple repair. Recently, a customer was told that she needed a transmission. Turns out she only need a fluid change and computer programming. Literally a fraction of the cost of a new transmission. Since our repair she has done over 10k miles without issue. That is a grand slam in my books, taking care of the customer trumps the dollar amount of the repair any day.