As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF SMOKE FILLED MORE THAN HALF COCKPIT. DONNED O2 MASK DECLARED EMERGENCY LANDED UNEVENTFULLY. SMOKE WAS FILLING AFT CABIN AS WELL, SMOKE CLEARED AFTER LANDING, RAN QRH. FLT 6331 PERFORMED OPERATIONAL TEST OF BOTH PACKS IAW AMM. NO SMOKE NOTICED IN COCKPIT & CABIN.