orange light

I have an APX 6000 handheld that I use with analog frequencies. I notice that the orange LED on top of the radio is on even when there is no radio traffic (at least the squelch is not broken). What causes the orange LED to be lit?

Today at work, my Motorola Radius CP200 slipped out of my hand and landed facedown in a puddle approximately 1/2" deep. I rescued it immediately and it worked fine but about 10 minutes later I noticed an orange light was on. This is present whether the radio is on or off. I replaced the battery...