A Transmission chain repair shop, decided to hire people off the street, give them some training, instead of paying good money, to a good Mechanic.
They had so many comebacks, and got rid of so many people, that at the end of the year, they sent out 23, W2 forms, for a 4 man shop.
So, it may be a learning curve. How many times are you willing, to go back through it, to get it fixed right?
A good Mechanic, will try to find out why it failed, and fix the problem, so it does not happen again, rather than just replace parts.