I just had the starter on my 2007 JK replaced. It had become somewhat erratic and unpredictable over the past 2-3 months. Now, when I turn the key the engine cranks / starts immediately. However, there is also a noticeable whine that starts when the engine turns over and fades out once the engine is running. In total, it lasts 3-4 seconds. I've never heard this and it only started when I had the starter replaced earlier today. Is something to worry about? Should I take my ride back to the mechanic and have him look at it again? Thx!