Be aware that even insurance companies have standards of repair hours for defects and most frequently the service facility asks for more hours and you must foot the difference. You generally do not find this out until your service facility does its diagnosis and contacts the insurance company. Then it is too late to back out, since you will owe for the diagnosis.
I had one such problem and contacted the insurance company myself to determine if the problem was covered. In retrospect, I should have gotten the insurance company's hours for the repair. I could have then went into the service company and asked if they could meet the covered hours.
Gale & Hank- 2012 Berkshire 390BH