As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PLANE RETURNED TO FIELD AFTER RECEIVING BLEED SOV CAS MESSAGE ON TAKEOFF, FOLLOWED BY LAV SMOKE CAS AT 1000 FT. BOTH INDICATIONS EXTINGUISHED WHILE RETURNING FOR LANDING. NO SMOKE WAS DETECTED. PASSENGERS DEPLANED AT THE GATE. LEFT MDPRSOV WAS REMOVED AND REPLACED, AND OPS CHECK GOOD ON REF TO 36-11-07.