As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX- FLIGHT 2011, RETURNED TO THE FIELD FOR A NR 1 ENGINE TORQUE SURGE. ACCOMPLISHED A UNEVENTFUL LANDING. MAINTENANCE REPLACED THE PRESSURE TRANSDUCER WITH NO HELP. THEN REPLACED THE PRESSURE INDICATOR. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.