Troy Bilt 42T Won't Move

I have a Troy Bilt 42T (made in 2018) that quit moving. The engine runs, blades turn, but when I engage the gear to move in forward or reverse I saw some white smoke from the front. I checked the belts and they are intact.

i plan to check the idler pulleys.

Is there any other way to diagnose the problem?

Model Number 13A277BS066
Serial 1F078B30020