What was found
DURING TAXI OUT, LEFT ENGINE EICAS, LEFT ENGINE START AND OVERHEAD VALVE LIGHT ILLUMINATED DURING START. AIRCRAFT RETURNED TO BLOCKS (BTB). MAINTENANCE DEFERRED IAW B767 MEL 80-00-2-1. MBCB 02-06-2026. PLACARD INSTALLED, MAINTENANCE PROCEDURE C/W. A/C REMAINS NO ETOPS. AIRCRAFT RETURNED TO SERVICE.