By Andrew Holleran Troy Aikman had to make a lot of tough phone calls when he decided to leave Fox Sports for ESPN earlier this offseason. None, though, were tougher than the phone call he had to make to FOX sideline reporter Erin Andrews. Aikman revealed that his phone call to Andrews was the toughest one he had to make when he decided to leave Fox Sports for ESPN’s Monday Night Football gig. “The toughest call that I had to make was to Erin Andrews and tell her that I was leaving,” Aikman said. “She’s like a sister to both of us.” Aikman and Andrews had been co-workers for a long time. The f…