As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN ALL PHASES OF FLIGHT THE ENGINE PARAMETERS PRESENT A LARGE DIFFERENCE, IN ORDER TO MAINTAIN EPRS THRUST LEVERS HAVE TO BE PLACE TWO KNOBS, LEFT FURTHER FWD THAN RIGHT. FLIGHT RETURNED TO BOG. RT ENGINE PT2 LINES WERE ADJUSTED AND TIGHTENED IAW TROUBLESHOOTING AMM 71-11-01 PG 505. RUN UP TEST WAS PERFORMED OK, WITH LT AND RT ENGINES.