As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE HAD VISIBLE SMOKE COMING FROM THE TAIL PIPE JUST PRIOR TO BLOCK IN. ALL INDICATIONS IN FLIGHT DECK WERE NORMAL. FOUND NR 1 ADP PRESS LINE BURST. REMOVED AND REPLACED THE LINE CLEANED RESIDUAL FLUID FROM THE COWLING AND SERVICED THE HYD FLUID. OPS AND LEAK CHECKED OKAY PER 29-11-40 AND 29-11-08.