What was found
AT ENGINE START UP, RIGHT ENGINE OVERTEMP ON START UO - TEMP REACHED 545 DEG C. AIRCRAFT RETURNED TO THE GATE. MAINTENANCE GROUNDED THE AIRCRAFT. MAINTENANCE TROUBLE SHOT IAW B767 FIM 71-05 FAULT TREE 801 AND FIM 71-08 FAULT TREE 816. ENG EXC PG ON EICAS SHOWED ENG 2 MAX EGT OF 545 DEG C FOR 0.1 SECONDS. PERFORMED EEC BIT CHECK IAW B767 FIM 71-01 FAULT TREE 8404. NO FAULTS NOTED AT THAT TIME. PERFORMED AUTO EVENT MSG CHECK AND CLEARED IAW B767 FIM 71-08 FT 810. NO FURTHER DISCREPANCIES. AIRCRAFT RETURNED TO SERVICE.