What area does Level 2 apparatus refurbishment cover?

Level 2 apparatus refurbishment specifically involves adding new components to an existing chassis. This process is geared towards upgrading or enhancing the capabilities of the fire apparatus rather than starting from scratch with a completely new chassis or frame. By adding new components, departments can improve efficiency, incorporate advanced technology, or modify the apparatus to better meet operational needs, while still utilizing the existing structure.

In contrast, the other areas mentioned focus on different aspects of maintenance or functionality that do not fall under the Level 2 refurbishment designation. Maintenance of existing crew compartments pertains to repair and upkeep, which is more aligned with ongoing maintenance rather than refurbishment. Inspection of equipment functionality relates to checking and ensuring all systems work properly, which is also critical but does not involve the refurbishment process. Therefore, the answer accurately reflects the primary focus of Level 2 refurbishment in terms of enhancing an existing apparatus.