As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L DUCT PRESSURE EXCEEDS 60 PSI LIMIT. AT 6000FT N1 69% L-61PSI R-40PSI. AT 7500FT N1 82% L-80PSI R-40PSI. AT 9000FT N1 95% L-80PSI R-40PSI. GROUNDED - YES. DIVERSION TIME 20 MINUTES - FOUND FLEX LINE AT PRECOOLER LEAKING P/N 16135-81. REPLACED FLEX LINE TO PRSOV, OPS AND LEAK CHECK OK REF B737-900 FIM TASK 36-11 TASK 803. GROUND VERIFICATION CHECK OK REF SAME.