As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 4227 - DURING CLIMB CREW WAS UNABLE TO MAINTAIN CLIMB TORQUE ON NR 1 ENGINE DUE TO HIGH OIL PRESSURE. MAINTENANCE ADJUSTED THE OIL PRESSURE REGULATING VALVE FOR NR 1 ENGINE IAW ATR MM. OPERATIONAL AND LEAK CHECK SATISFACTORY. AIRCRAFT RETURNED TO SERVICE. (X)