My 99LS400 dash warning light showed me the tail light failed. Upon checking, one of the brake lights was gone and replaced. The message did not go away. I googled it and found this is a common LS issue and I have to live with it. Few weeks passed and I found this message or the red dot really bothers me. Today, I decided to check all the lights at the back. Finally, I found one of the 2 high-mounted brake lights inside the car was gone. I replaced both and no more messages.
My little assignment on the long weekend is completed

 

Lots of people miss the third brake light as the bulb which is burnt out. Been talked about many times here.

 

One of the bulbs in the high mount brake light was burnt out since I get the car in '08. I recently replaced both bulbs in July, 2022.

LT - Original Koito working bulb. RT - Original Koito burnt out bulb (HOT capsule).

Never had a bulb failure warning.