As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DISCREPANCY: ON TAKEOFF AND CLIMB, THRU 2000 FT LEFT DUCT PRESSURE CYCLES RAPIDLY FROM 10-80 PSI. RIGHT DUCT PRESSURE CYCLES 85-45 PSI, BOTH STOP CYCLING BETWEEN 6-8K FEET. CORRECTIVE ACTION: PERFORMED FIM TASK 36-20 FAULT TREE 803 ENGINE RUN AND TAXI VERIFICATION COMPLETE. GROUND VERIFICATION COMPLETE, OPS CHECK GOOD. AIRCRAFT REMAINS ETOPS 180