Led Indicator color issue

[kwatch]

I received Note 9(VZW) directly from Samsung 3 days ago. I traded in Note 8 and received $500 credit. It is my fistst purchase from Samsung.

Everything works fine except the LED Indicator. I don't see any problem with Red, Green and Blue colors. I noticed the color of KakaoTalk notification LED is not solid yellow as it should. It looks close to light green(half yellow and half green). If I let it blink for a while, it sometimes changes to Yellow and go back to light green. I installed "Light Manager" and tested all available colors. I see a problem with Yellow, Orange and White. Yellow looks like light Green, Orange looks like Yellow and While looks like light Cyan. If I them blink for a wile, the correct color of Yellow and Orange sometimes light. However, White remains light Cyan.

I think my Note 9 is defective. Has anyone exchanged a defective phone from Samsung? What process do I need to go through?

Thanks.