As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYS - RT ENG DUCT PRESSURE WAS INTERMITTENTLY HIGH AT CRZ THRUST AND ABOVE. PRESS NORM AT LOW THRUST.( L DUCT PRESS 23 PSI)( R DUCT PRESS 38 PSI). PERFORMED AIR SUPPLY BITE IAW FIM 36-20-00. LT ENG HPC FAULT. INSPECTED HPC CONNECTOR AND SENSE LINES AND HP VALVE. NO DISCREPENCIES NOTED. RAN BOTH ENGINES DUCT PRESSURE NORMAL. NO FAULTS NO EICAS MSGS.