How many miles you have on the Truck total?
I see your Trip A says 1101, but what's the total?

That light usually comes on for the next oil change.
I also have a Limited with gauges exactly like your's.
I will get that message briefly at 500 miles before my next oil change (service) when I first start my truck.
Then, and I think so don't quote me, 100 miles before the oil change (service) is due, it will come on and stay lit.
The message and light both stay on solid and will not go away until a reset has been done.

To re-set the maintenance light.
Turn key to "on" position
make sure "Trip A" is displayed
Turn key "off"
While "off", press and hold the Trip re-set button on the speedometer
Continue to press the re-set button and turn key to "on" position.
While pressing the re-set, you will see a count down displayed in the message window.
When the count down is done, you are good till your next service is due...5000 more miles.

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Nice truck!...Sorry about your penis.
2007 DC Tundra, 5.7L, Limited, Factory NAV, TRD, TRD Duals, TRD CAI
Truxxx 3" + 1" lift, Rear Supersprings, BFG TA/KO 305/65R18