As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED LH ENG COWL A-ICE CAUTION MESSAGE IN FLIGHT WITH SYSTEM OFF. RAN QRH, MESSAGE CLEARED AFTER CLOSING LH 14TH STAGE SOV. LH PRESSURE RELIEF VALVE WAS FOUND TO BE OPEN ON THE GROUND. ***AIRCRAFT REMOVED FROM SERVICE*** R&R LH ENG COWL ANTI-ICE VALVE IAW AMM 30-22-01. RESET RELIEF VALVE IAW AMM 30-22-04. OPS CHECK OF BOTH GOOD. P/N:5399-00-1, S/N OFF:0182B, S/N ON:0692B. MPM