As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER T/O SMOKE IN MID CABIN WITH SMOKE DETECTOR GOING OFF IN MID CABIN. RETURNED TO LAND. LT PACK TRIPPED AND LT ENG BLEED LIGHT ILLUMINATED. ON GROUND SMOKE DISSIPATED. COMPRESSOR WASH NUMBER 1 ENGINE. AFTER WASH - RUN ENG 5 MINS AT IDLE, RUN PACKS/CYCLE A/I SYS. RUN ENG AT PWR ABOVE 60 N1 FOR 5 MIN-R PACKS/CYCLE A/I SYS. TO PREVENT ATB OR RTO DUE TO SMOKE/OD IN CABIN. PERFORMED ENG WASH PER 72-00-00-7-G-00.