The service member confirmed my suspicion that my EGR valve needed to be replaced. They also checked my battery to confirm that the difficulty in turning over the vehicle was not battery related. Battery was good, EGR valve was not. They got the part and replaced it in a couple of hours. I knew it wouldn't be a quick fix so I was prepared with a lunch for my 2 year old daughter. We were able to keep ourselves occupied in their kids' corner and an extra snack from their snack/drink stash was a savior toward the end of our waiting period. Once again, honest, fast work. Much appreciated.