As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING CLIMB WITH CLIMB THRUST SELECTED ON TRI, ALL THE RIGHT ENGINE PARAMETERS FLUCTUATE. EPR + - .02/N1 +- 1%/ EGT + - 5 DEGREE C/N2 +- 1/2%/FF ALSO. RIGHT THROTTLE DID NOT MOVE. NO ICING. ENGINE ANTI-ICE ON OR OFF. OSCILLATION APPROX. 1 CYCLE PER SECOND. MAINTENANCE REMOVED AND REPLACED THE ENGINE INSTRUMENT CLUSTER IAW AMM 77-42-00. PREFORMED ENGINE RUN IAW AMM 71-00-00. EPR OPS CHECK GOOD.