As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GROUND CREW REPORTED SMOKE COMING FROM FRONT OF # 2 ENGINE Q6TR841X. GROUNDED - YES. OPENED ENGINE # 2 FAN COWLS REF B737-9 AMM 71-11-04 AND PERFOMED GVI OF ENGINE NO DEFECTS NOTED, CREW RAN ENGINE OPS CHECK NORMAL FAN COWLS CLOSED REF AMM 71-11-04.