As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT BLEED DUCT CAUTION MSG IN FLIGHT. PERFORMED LEAK TEST & FOUND MT139L CHANNEL A INDICATING A FAULT. INSPECTED DETECTION LOOP A & FOUND IT CONTACTING NR 1 HYD ACCUMULATOR. REPOSITIONED IAW AMM 36-21-01. OPERATIONS CHECKED GOOD IAW AMM 36-21-00.