As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE BLEED OFF INDICATION WHEN TURNING WING ANTI-ICE ON (DUCT PRESS 10 PSI). WHEN USING WING AND ENGINE ANTI-ICE ON DESCENT THE LEFT ENGINE BLEED OFF INDICATION ON EICAS. FOLLOW QRH AND RIGHT DUCT PRESS WAS NOT ENOUGH TO SUPPLY THE DEMAND FOR THE ANTI-ICE OPERATION. FOUND LT ENGINE PRV STICKING. REMOVED AND REPLACED PRV IAW AMM 36-11-18-004/404. OPS TEST GOOD.