As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT 1820-DIV-AFTER T.O. LEFT ENGINE BLEED OFF EICAS MESSAGE ILLUMINATED. QRH APPLIED. PROBLEM DID NOT CLEAR. LEFT BLEED PRV STATUS MESSAGE DISPLAYED. CORRECTIVE ACTION: SWAPPED PRV AND HPSOV AND DEFERRED PER MEL 36-11-02. RTN SERVICEABLE PRV BACK TO HPSOV POSITION. REPLACED FAILED PRV. OPS CK GOOD.