As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AHM ALERT, DOOR L2-3 CCS RDC 05 CAN RESPONSE FROM THE L3 DOOR EMERGENCY LIGHT SYS PRIME CONTROL ON CAN BUSS 4 IS NOT RECEIVED. WITH FAULT CODE 42-02164. PERFORMED LRU REPLACEMENT TEST CROWN DOOR 3-2L CCS REMOTE DATA CONCENTRATOR 05. OPERATIONS CHECK NORMAL, NO EICAS MESSAGES IAW MM 42-21-07.