What was found
THE FLIGHT WAS DISPATCHED UNDER MEL FOR BLEED NR2 INOP AT APPROX FL220 THE ACFT DEVELOPED A BLEED NR 1 LEAK. THE FLIGHT REDUCED THE FLIGHT LEVEL AND RETURNED AND LANDED APPROX 1500K OVERWEIGHT. SOON AFTER ENCOUNTERING ICE COND IN CLIMB THRU FL200 EICAS BLEED NR 1 LEAK FOLLOWED BY WING A-I FAIL. CABIN BEGAN SLOW DEPRESSURIZATION. QRH ACTIONED WING A-I FAIL CLEARED AS DID BLEED NR 1 LEAK BUT VALVES STAYED CLOSED DEFECT RECTIFICATION: FOUND LT WING ANTI-ICE VALVE CLAMPS LOOSE. RETORQUED ANTI-ICE VALVE CLAMPS IAW AMM 30-11-01-04 LEAK CHECKED SERV.