As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE F/A HEARD A BANG NOISE MID CABIN. COCKPIT AND CABIN THEN SMELLED FAINT SMELL OF SMOKE. RUN QRH; SMELL IMMEDIATELY CLEARED OUT.<[01] PERFORMED CONDITIONAL INSPECTION FOR SMOKE IN CABIN PER AMM 05-51-56. DETERMINED CAUSE OF SMOKE & ODOR TO BE A DEFECTIVE LT PACK ACM. ACM REPLACED PER AMM 21-51-04. REFER TO LOGPAGE #2101069 FOR CORRECTIVE ACTION & PARTS REPLACEMENT.