As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED LT BLEED DUCT WARNING MESSAGE IN FLIGHT, FOLLOWED BY LT BLEED DUCT CAUTION MESSAGE AND ASSOCIATED LOSS OF PRESSURIZATION. CREW RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED LT BLEED DUCT LOOPS FOR DEFECTS AND LEAKS. NONE FOUND. MAINTENANCE PERFORMED OPS TEST OF BLEED AIR LEAK DETECTION SYSTEM. OPS TEST GOOD. ALL WORK ACCOMPLISHED BY MAINTENANCE IAW AMM. AIRCRAFT RELEASED FOR SERVICE.