What was found
@ 17000 IN CLIMB L BLEED DUCT CABIN ALTITUDE NEAR 7900 BOTH BLEEDS WERE SHUT ON EICAS RAN QRH AND DECENDED TO 10000 AFTER LOOSING PRESSURIZATION RETURNED TO JFK QRH 7.22. T/S L BLEED DUCT - WARNING MSG PER FIM 36-21-01. FOUND MT137 MAKING CONTACT WITH LH COWL A/I DUCT AND MT203 LOOSE. REPOSITIONED MT137 AND REINSTALLED MT203 IAW AMM 36-21-01 AND PERFORMED OPS TEST WITH BOTH ENG/APU RUNNING IAW AMM 36-21-00. ALL CKS AND NO MSG AT THIS TIME.