What was found
FLT#2924, STI-BOS. (AIRCRAFT PERFORMED AN AIR RETURN TO STI) DIRTY COCK ODOR EVENT SHORTLY AFTER TAKE OFF. STRONG IN BOTH CABIN AND COCKPIT. RAN ODOR ISOLATION PROCEDURE. DID NOT HELP, BOTH PACKS APPEAR TO BE CONTAMINATED. SUSPECT APU BLEED AS SOURCE. AIRCRAFT HAS A HISTORY OF ISSUES. ODOR REPORTING FORM COMPLETED. ( PACKS ); COMPLIED WITH INFO NOTICE 2017-T015SEC A , ISOLATED FAULT TO TYPE TO 9 AMBIENT AIR) PER TSM 05-50-00-810-085-B/TSM 05-50-00-810-085D. PERFORMED APU COMP AND BLEED DUCT BLACK LIGHT INSP REF LH346887 ITEM 1 FOR ENG #1&2 INSP . A/C OK FOR SVC. MDDR CLEARED. MX4 UPDATED, PLACARD REMOVED.