As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - FL 591 - ON CLIMB-OUT FROM PIT, CREW NOTED SMOKE COMING FROM BEHIND THE GLARESHIELD. FLIGHT RETURNED TO PIT AND LANDED WTIH NO FURTHER INCIDENT. MAINTENANCE COULD NOT FIND A DEFINITIVE PROBLEM. BLOWER FAN NR 3 WAS NOTED AS HAVING SOME VIBRATION, AND WAS CHANGED AS A PRECAUTION. (X)