As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON PUSH BACK GROUND CREW NOTICED SMOKE COMING FROM WHEEL WELL. TIGHTENED B NUT ABOVE SHUTTLE VALVE, ABOVE FLAP ACTUATOR. THEN SECOND PUSHBACK WITH B PUMPS ON AND BRAKE SET, THE SMOKE REAPPEARED. REPLACED LINE BETWEEN BRAKE MEETING VALVE AND BRAKE SHUTTLE VALVE PER MM.