maintenance

Per the User Manual, the only required testing is electrical safety testing and physical insptection.  I haven't been able to locate a service manual:

Inspecting the system Routinely check the instrument for exterior damage. Follow your medical facilities safety guidelines.

It is recommended/required that you perform regular electrical continuity tests from exposed conductive materials on the medical system to the protective ground on the medical system. Regular testing will help ensure that proper protective grounding is maintained. This test should always be performed after installation and maintenance. Additionally, this test should be performed on a regular maintenance basis.