As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON POWER REDUCTION AFTER TAKEOFF, THE NR 1 EPR INDICATION BECAME ERRATIC. THE AIRCRAFT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED A BROKEN PT7 LINE WITH A SERVICEABLE PART AND SYSTEM OPERATION RETURNED TO NORMAL.