As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PARKED AT GATE, EICAS "PRESN AUTO FAIL" PRESENTED. WHITE SMOKE NEAR THRUST LEVERS AND ELECTRICAL BURNING SMELL. FOUND "PRESS CONTROL" F8 BREAKER POPPED. (ENGINES WERE NOT RUNNING)-C/A-FOUND SMELL AND WHITE SMOKE COMING FROM AUTO PRESSURIZATION DIGITAL CONTROLLER. RESET BREAKER (F8) REMOVED AND REPLACED DIGITAL CONTROLLER IAW EMB-145 AMM 21-31-01, OPS CHECK GOOD. NO DEFECTS NOTED.