What was found
30 SECONDS INTO START SEQUENCE, PILOT REPORTED COCKPIT BEGAN TO FILL WITH SMOKE. APPEARED TO BE COMING FROM CO-PILOT FOOT AREA. MX INSPECTED UNDER CO-PILOT SEAT, RADIO RACK, AND BEHIND AND UNDER INSTRUMENT PANEL. NO SMOKE SMELL, BURNED WIRES, OR DISCREPANCIES NOTED. GROUND RAN ACFT WITH NO DISCREPANCIES NOTED.