Just need auto advice Okay rebuilt the transmission on my car because it was burnt out, i paid 1100 for it?

and got a 6 months warranty so about a month later, the check light on the car started to show and now the break light is showing car i take it back to the mechanic who did the transmission to fix it because the 6 months is not expired yet??

Take it in for the cel but the the brake light because, obd system (not sure what car you have) have sensors on the tranny too.