What was found
UNABLE TO CONTROL CABIN LIGHTING DUE TO "ECS NO COMM" MESSAGE ON CACP. L1 DOOR CACP INOP. REPLACED ZMU 1 IAW MM, GROUND CHECK NORMAL.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
UNABLE TO CONTROL CABIN LIGHTING DUE TO "ECS NO COMM" MESSAGE ON CACP. L1 DOOR CACP INOP. REPLACED ZMU 1 IAW MM, GROUND CHECK NORMAL.