As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED LT ENGINE BLEED AMBER CAUTION MESSAGE IN FLIGHT. CREW COMPLIED WITH QRH AND RETURNED TO FIELD. MAINTENANCE TROUBLESHOT, R & R LT ENGINE PRESSURE-REGULATING SHUT-OFF VALVE AND PERFORMED CHECKS IAW AMM. AIRCRAFT RELEASED FOR SERVICE.