Couple of things to look for. Have you used a circuit tester to make sure it isn't a switch that is bad? If there is no power in the door, check the rubber boot that is between the door and truck body. Inside the boot are many wires to the power door locks, windows, mirror...etc. Over time the wires sometimes break due to opening and closing the door many times. I've found that and a bad switch are the most common problems in GM trucks.
Good Luck
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