Service technicians possessing both skill and knowledge in garage door repair, replacement and installation with years of experience under their belt.
If you notice even the slightest sign of wood decay, you have to remove the decayed part with a file and sandpaper and use wood filler to repair the panel. Greatly decayed panels have to be replaced with new ones. After the repair, you have to repaint or re-stain the whole door to protect it from water damage in the future.
This sound is produced when a spring gets broken. This happens because of the release of the tension which the component holds. When you go to the garage, you must not touch anything but provide visual spring inspection. The broken component must be replaced straight away.