As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER TAKEOFF CREW REPORTED A PRESN AUTO FAIL MESSAGE ON EICAS. AFTER RUNNING QRH THE PROBLEM RETURNED. F/A REPORTED THERE WAS SMOKE IN THE CABIN. HOWEVER WE BELIEVE THIS TO JUST BE CONDENSATION. MAINTENANCE REPLACED THE OFV ACTUATOR PER EMB AMM.