What was found
PRESN AUTO FAIL YELLOW CAS: AT FL400 CRUISE THE FOLLOWING CAS MESSAGES ILLUMINATED: PRESN AUTO FAIL, SWPS FAULT, AP FAIL, AMS CTRL FAIL, YD FAIL, STBY BARO FAIL, GSD 1 FAIL, SEPS ICE SPEED, HSDB FAULT, LEFT MAIN GEAR DISAGREEMENT, ADS 1 HTR FAIL. STARTED AT THE TOP OF THE LIST TO PERFORM EACH ASSOCIATED QRH PROCEDURE. PERFORMED A MANUAL GEAR EXTENSION AS PER THE QRH. SENT CMC DOWNLOADS TO EMBRAER CONTACT CENTER. REF CASE NUMBER: EEJ -04136720. DISPOSITION FROM CONTACT CENTER WAS TO REPOSITIONED GSD41 # 1 AND GSD4 L #2 UNITS. PASSED INFO ALONG TO MCC AND THEY AGREED SINCE THERE WAS NO HISTORY OF FAILURES ON THIS AIRCRAFT. REPOSITIONED GSD41 # L AND GSD4 L #2 UNITS IAW EMB-5058 AMM TASKS 31-41-01-000-801-A, & 31-41-01-400-801-A. PERFORMED SOFTWARE CONFIGURATION UPLOADING OF THE DATA CONCENTRATOR UNITS IAW EMB-5058 AMM TASK 31-41-01-470-801-A. PERFORMED OPERATIONAL TEST OF THE DATA CONCENTRATOR UNITS IA W EMB-505S AMM TASK 31-41-0L-710-801-A. UPLOAD CHECKS AND OPS CHECKS GOOD.