If you have an issue like that (I’m going to guess there was a noise that you had to do something to create). It’s always best to insist on going with the Tech for the test drive to make sure he/she is actually doing what you do to create the issue. Can’t speak for what happened here, but I run into that issue sometimes, people are very vague in their description of the issue and you only get 18 minutes for initial diagnosis. So if you don’t find something in that time frame and the service manager doesn’t authorize more it goes outside or your working on it for free.
yours is a 98 man unless there was a recall never performed nothing that old is covered