sungyoung, you are not the only one...........B777s with P & Ws have an ongoing issue with their ignition problems........our aircraft have the same problems.....replaced everything according to FIM but problem still there.........dont worry the P&W guys know about it.......wait for a mod coming up!!!! Dont ask me when??? It is intermittent isnt it??? Fault goes away for a few Start cycles then comes back again........then disappears and the comes back again........will pm you if I come across some new info!!!