As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DISCREPANCY: LEFT DUCT PRESSURE INDICATOR FLUCTUATES BETWEEN 15 AND 55 PSI AT TAKEOFF THRUST FROM TAKEOFF AND CLIMB UNTIL ABOUT 8000 FEET THEN BEGINS TO NORMALIZE. FOUND PRV SENSE LINE (SIC), REPLACED O-RING IAW AMM 36-11-18, OPS CHECK AND LEAK CHECK GOOD. AC REMAINS ETOPS 180.