As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOS - FLT 1527 - AFTER TAKEOFF BOS CREW NOTICED SMOKE IN CABIN. RETURNED TO BOS AND LANDED WITHOUT INCIDENT. CHANGED APU AND REPLACED BOTH WATER SEPARATOR BAGS. CLEANED INSIDE OF WATER SEPARATOR AND ACCOMPLISHED PACK BURNOUT OF HIGH PRESSURE DUCTING. ALL WORK ACCOMPLISHED PER MM. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)