As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT, AFTER ENG START L AOA PROBE EICAS MSG. AIRCRAFT RETURNED TO BLOCKS (BTB). MAINTENANCE REMOVED AND REPLACED K400 RELAY AND CHECKED WIRES ON RELAY IAW WDM 30-32-11 AND PERFORMED OPERATIONAL CHECK OF N2 SPEED CARD IAW AMM 30-32-00 AND FIM 30-32 FT 804 OPS GOOD, A/C REMAINS NO ETOPS