As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, THE LEFT ENGINE BLEED STARTED SURGING BETWEEN 10 T0 30 PSI UNTIL FL 240, AND THEN STABILIZED. LEFT BLEED MATCHED WITH RIGHT IN CRUISE EACH WAYPOINT 35-40 PSI AT FL 360 NO EICAS MESSAGES OR STATUS MESSAGE. REPLACED FAMV AND CLEANED TERMINAL STRIPS. OPS CHECKED GOOD IAW AMM 76-11-16, & 36-11-09.