No idea, but here's some questions that spring to mind.
Which pulley and belt?
Why did they come off?
What did they replace, what had to be disturbed to do the repair?
Is anything in the area of replacement getting unreasonably hot after a short run?
Other questions regarding software updates are good ones, just harder for you to get to the bottom of that on your own.
Was anything else done at the same time out of courtesy.
Don't want to insult your intelligence, are you doing tank to tank refills to calculate your mileage?
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2004 TJ, 4.0L, Manual, finally reliable and fun.
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