What was found
ON TAXI OUT WE RECEIVED MULTIPLE WARNING AND CAUTIONS TO INCLUDE: GEAR NOT DOWN, SPOILER, APU FIRE, FWD CARGO FIRE. MULTIPLE CAUTIONS WERE PRESENT. THEY LASTED APPROX 1 MIN, THEN STOPPED. APPROX 2 MINS LATER THEY CAME BACK AGAIN. AT THIS POINT WE DECIDED TO RETURN TO THE BLOCK. AFTER SHUTTING DOWN LEFT ENGINE ALL WARNINGS STOPPED APPROX 15 SECONDS AFTER SHUTDOWN RELEASED FOR SERVICE PER MEL : 31-41-01-02 "MEL 31-41-01-02: L EICAS COMPUTER - INOP." BITE TEST C/O OF PSEU IAW MM 32-09-04 NO FAULT APPARENT. DUE TO NUMEROUS EICAS FAULT PSEU REPLACED IAW MM 32-09-04-4. FACT 03MAR20 07:29 CDG REMOVED AND REPLACED LEFT EICAS COMPUTER IAW AMM 31-41-02-4. OPS CHECK OK.