These are probably system test switches for the Power Guard circuit. The Power Guard circuit is supposed to prevent amplifier clipping by automatically turning down the input volume when it senses the amp approaching clipping volumes. There's some descriptions of it if you Google.
If you have the owner's manual, there may be a discussion of Power Guard and the system test function for it.
If you have the owner's manual, there may be a discussion of Power Guard and the system test function for it.