As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 331 IAD-MCO, AIR RETURN TO IAD DUE TO SMOKE AND HAZE IN ENTIRE AIRCRAFT PRIOR TO ROTATION FOLLOWED BY BLEED 1 FAIL AT APPROX 1000 FEET. CREW DECLARED EMERGENCY AND A/C RETURN TO FIELD. PERFORMED VISUAL INSPECTION PER FIM 21-20-00-810-801-A AND NO DEFECTS NOTED IN AIRCRAFT. SUSPECT CONTAMINATION OF BLEED SYS DURING R/R OF NAPRSOV. A/C OK TO CONTINUE SERVICE.