As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS THAT THE AUTO THRUST REMAINED AT IDLE AND WOULD NOT MAINTAIN SELECTED SPEED DURING DESCENT AT 10000 250 KTS. MAINTENANCE TROUBLESHOT THE ISSUE TO THE FMU. REMOVED AND REPLACED THE E2 FMU IAW AMM 73-22-52-400-010. OPS CHECK GOOD.