As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX- AFTER NORMAL TAKEOFF AT PDX ON CLIMBOUT, TORQUE ON NR 1 ENGINE STARTED DROPPING OFF. A 45 PERCENT TORQUE DIFFERENCE ON NR 1, 2.3 INCH SPLIT ON POWER LEVERS. AT CRUISE 50 PERCENT ON NR 1, 90 PERCENT ON NR 2. AIRCRAFT RETURNED TO FIELD, UNEVENTFUL LANDING OCCURRED. REMOVED AND REPLACED NR 1 HMU AND FUEL PUMP ASSEMBLY. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE. FUEL PUMP (P/N 3037610).