As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE LEFT ENG EPR APPROX 1.3 EPR HIGHER THEN RT ENG WITH ALL OTHER PARA EQUAL. IN CLIMB WITH THROTTLES EQUAL RT PARA'S MUCH HIGHER THEN LEFT. LOUD RESONANCE SOUND ROWS 19-24 DURING PWR CHANGES. *S/D* THE NR 2 ENGINE WAS REPLACED FOR DIFFERENCES IN EPR BETWEEN ENGINES AND PERFORMANCE DETERIORATION.