What was found
LEFT WING BLEED LOOP, FLT DIVERTED. FOUND SEAL LEAKING WHICH IS PART OF VALVE 644-9042. ON CHECK OF THE AIR SYS, MX FOUND ACM GASKET LEAKING. ON ATTEMPTED REPAIR OF GASKET DISCOVERED THAT HELICOIL ON ACM FAILED. REPLACED LEFT ACM IAW AMM. NO LEAKS NOTED, OPS CHECKED NORMAL.