As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1180 PDX-PHL, APPROXIMATELY 5 MINUTES AFTER TAKEOFF, SMOKE STARTED COMING OUT OF CENTER GLARESHIELD PANEL (AUTOPILOT PANEL). WE TURNED OFF BACKGROUND LIGHTS AND RETURNED TO PDX. SMOKE STOPPED SHORTLY AFTER TURNING OFF BACKGROUND LIGHTS. MX R&R THE FLT CONTROL UNIT. OPS CHECK WAS GOOD.