What was found
LEFT BLEED DUCT WARNING MSG IN FLIGHT FOLLOWED BY L BLEED CAUTION MSG AND A CABIN ALT MSG AT 10K FT. HAZE IN CABIN. PERFORMED LEAK CHECK OF LT ECS IAW AMM 21-51-00-790-801. FOUND V-BAND CLAMP AT AFT OF LT DUAL HEAT EXCHANGER LOOSE. REINSTALLED CLAMP (FIGURE 401, ITEM 16) AS REQUIRED IAW AMM 21-51-06-400-801. NO FURTHER ECS FAULTS. OPS CHECK GOOD. PERFORMED ECS OPS CHECK IAW AMM 21-51-00-710-801 USING APU AND EITHER ENGINE. NO HAZE, SMOKE, CONDENSATION, OR ODORS NOTED. OPS CHECKED GOOD.