What fuse is being replaced?
Recent repairs before the problem started happening?
I didn't realize that since you only stated that fuses had been changed to repair the problem. Make sure he disconnected all of the sensors, the capacitor and the relay or he will get a faulty reading.
I'm not sure what you mean about the deposit?? Your deposit stays in your JustAnswer account until you accept or ask for a refund. As of now, it is still your money to do with as you please.
Please let me know if you need more help. I hate to see any vehicle broken down, especially a Mazda!