As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED THAT THE MAINTENANCE DIAGNOSTIC COMPUTER (MDC) BEING INOPERATIVE. THE MAINTENANCE VENDOR DETERMINED THE MDC TO BE FAULTY AND REPLACED IT WITH AN OVERHAULED UNIT. OPS CHECKS WERE SATISFACTORY AND THE AIRCRAFT WAS RETURNED TO SERVICE.