99 camry 3.0 auto, the signal + lights = trans slip ​​​​​​​
 

Just won this Camry in a race and all things aside it's in good condition, except if the headlights and the turn signals/hazards are on at the same time the trans slips. Also turn signals both flash w/ headlights on and reverse light flickers with them. And no instrument cluster backlighting. Could this be a bad multifunction switch or am I looking at a much larger problem?