We start by identifying the exact panel section - height, width, and whether it's insulated - matched against your door's model tag where one exists. On older doors without a legible tag, we measure directly off the track and the existing sections.
Once we've got the right panel, we remove the fasteners holding the damaged section, disconnect it from adjoining panels and hinges, and lift it out without disturbing the spring tension on the rest of the door. The new section goes in, gets bolted to hinges and end caps, and we check that it tracks straight before reattaching rollers.
Last step is running the door through a full open-close cycle under power, checking for binding at the seams and confirming the opener's force settings still match the door's new balance. A panel swap changes the door's weight distribution slightly, and skipping that check is how you end up back here in six months with a strained opener.