What was found
FLT 1691, JFK-LIR( AIR RETURNED TO JFK). DUE TO FUMES COCKPIT. RETURNED TO JFK, LANDED OVERWEIGHT. NICE SMOOTH LANDING. PERFORMED OVERWEIGHT LANDING INSP REF AMM 05-51-11. NO HARD LANDING OR LOAD 15 REPORTED BY CREW OR AIDS. A/C OK FOR DISPATCH.FUMES REPORTED BY CREW. FUMES ARE CABIN ODOR REPORTED. PERFORMED CABIN ODOR INSP REF TSM 05-50-00. ISOLATED BLEED SYSTEMS TO APU BLEED. AS PRECAUTIONARY APPLYING APU BLEED TO MEL 36-12-01 CAT CMCC AL ESPONIZA ADVISED. MX 4 UPDATED. PLACARD INSTALLED. INFO NOTICE 2017-T5G APPLIED.