As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FCDM1 FAILED IN FLIGHT. DURING MTF MOC FOR FCDM 1 FAILURE, DETECTED FCDM 1 SYSTEM FAILED AFTER SWAPPING OF FCDM 1 AND 2 POSITION. SWITCHED THE RCU FROM N TO 1 AND THE SYSTEM DID NOT WORK, SWITCHED TO FCDM 2 AND SYSTEM WORKED WITH FCDM 1 INDICATION ON BOTTOM LEFT OF ALL 4 SCREENS. REPLACED RCU IAW AMM 32-61-00, 5-5 GROUND MOC OK.