Replace Suspected Coil Pack

What happens here

After confirming a cold coil pack, the presenter decides to replace it. He uses a ratchet to unbolt the suspected faulty coil pack from the engine block. He notes the old coil pack is visibly oily and dirty, with signs of coolant contamination, confirming his earlier visual inspection findings. He replaces it with a new Duralast ignition coil (Part C1208). After replacing the coil pack, he restarts the truck and finds that the misfire is still present, and the 'Service Engine Soon' light remains on. This leads him to believe the issue is deeper than just one coil pack.

Goal: Replace the coil pack identified as faulty.