What was found
NR 1 BLEED LEAK ECAS WARNING MESSAGE ALONG WITH LEAK ILLUMINATED ON THE NR 1 BLEED SWITCH. COMPLIED WITH THE QRH AND BOTH MESSAGES EXTINGUISHED. APU WAS OFF. INSPECTED THE DUCTS AND SENSE LINES AT THE NR 1 PRECOOLER AREA AND FOUND SEVERAL CLAMPS LOOSE. SECURED THE CLAMPS, LEAK CHECKED GOOD. CHECKED OPERATION OF THE NR 1 BLEED LEAK DETECTOR THERMOSTATS. NO DEFECTS NOTED. RAN THE ENGINES, OPERATED THE NR 1 BLEED FOR 10 MINUTES. OPS AND LEAK CHECKED GOOD.