As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 5035 -ATB- RETURNED TO BOS AND DECLARED EMERGENCY DUE TO VISIBLE SMOKE IN THE CABIN ON TAKEOFF. CORRECTIVE ACTION: PERFORMED TROUBLESHOOTING PER NO GO ODI WORKCARDS. FOUND APU OVERSERVICED. CLEANED APU COMPARTMENT AND PERFORMED ECS DUCT DECONTAMINATION. (6795318)