As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THE ENGINE DIAGNOSTICS SYSTEM (EDS) WHITE ANNUNCIATOR ILLUMINATED. OPERATIONS WERE CONTINUED PER MEL 77-6. THE MAINTENANCE VENDOR TROUBLESHOT AND DETERMINED THE EDS WAS DEFECTIVE. THE EDS WAS REMOVED AND REPLACED WITH A REPAIRED UNIT. OPS CHECKS WERE SATISFACTORY AND THE AIRCRAFT WAS RETURNED TO SERVICE.