As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EICAS MSG L ENG BLEED OFF DISPLAYED L ENG BLEED AIR OFF LGT ILLUMINATED WITH ENG RUNNING AND SW ON. DUCT PRESS WENT TO 5 PSI. REMOVED AND REPLACED REVERSE FLOW CHECK CONTROLLER PER AMM 36-11-18-4. OPS CHECK IAW 36-11-00-5. OPS CHECK OK. (M)