What was found
AIRCRAFT WAS GROUNDED: ON CLIMB, ELECTRIC BUS L1 EICAS ILLUMINATED. FLIGHT DECLARED AN EMERGENCY, RETURNED TO PHL LANDING SAFELY. ACCOMPLISHED TASK DMC-B787-A-24-20-F2-M8A-421A-A FOR MAINT MSG 24-41041 (LEFT-1 230VAC/115VAC-TO-540VDC AUTOTRANSFORMER RECTIFIER UNIT PROTECTION IS ON). FOUND TERMINAL LUGS BROKEN AT TS16111 TERMINAL BLOCK. REPAIRED FEEDER CABLES (AALA202209278655) AND TERMINAL LUGS (AALA202209272342) PER JOB CARD 2419D001-003. ACCOMPLISHED SATISFACTORY L1 GENERATOR OPERATIONAL CHECK.