I own a 2005 Lexus LS 430. Something blew under the good. Looks like a reddish liquid. The CSC light came on. What might my problem be?

SOURCE: 2004 Lexus Ls 430 Low tire

My 2004 Lexus LS 430 has had the light come on several times, even after changing all four tires. There are no tire pressure sensors on my four tires. I was told the car computes tire rotations and since a low pressure tire takes more rotations than a fully inflated tire, the computer puts up a message on the dash.
To reset/turn off the message, put the emergency brake on, start the car and reach below the dash to the right side of your steering column until you feel two buttons in a depressed area under the dash. One button turns on /off your smart key and the other will turn off your tire low pressure message. Depress and hold until the message on your dash goes out and you are good to go. I know this works, I just reset mine a few minutes ago.