As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT WE HAD MULTIPLE EICAS, TEST AND STATUS MESSAGE THAT CONTINUED TO DISPLAY C/B EIU L-C-R PULLED OUT FOR SWAP EIU MODULES. EUI L SWAPPED WITH EIU C FOUND SATIS STS MSG SHOWN €Œ EIU C €Œ.<BR>CONSULTED WITH MCC FAULT CONFIRM FROM EIU L. A/C DECLARED AOG FOR AWAITING SPARE PART(PN:822-2481-101). ALL OF EIU BACK TO ORIGINAL POSITION AND C/B PULLED AND COLLARED.