What was found
CRG AFT FIRE SYS FAIL AND CRG FWD FIRE SYS FAIL EICAS ILLUMINATED IN FLIGHT. PERFORMED EXTENSIVE TROUBLESHOOTING OF MAU NR 3 GEN I/O AND ASSOCIATED CONNECTORS. PERFORMED CONTINUITY CHECK OF FIRE BOTTLE WIRING FROM RESPECTIVE CONNECTORS TO MAU NR 3. NO DEFECTS NOTED. REMOVED AND REPLACED GEN I/O 3 MODULE. PERFORMED SOFTWARE TARGET LOAD OF MODULE. SOFTWARE LOAD GOOD. NO DEFECTS OR EICAS MESSAGE NOTED. A/C IS OK FOR RETURN TO SERVICE IAW EMB190 AMM 31-41-06-400-801-A, 31-41-00-970-801A AND 45-45-40-470-801-A.