When I had begun to explain how those QAS capacitors used in the ECU were risky several years ago, almost no one has paid any attention nor understood me. May be because my English was limited. But LScowboyLS was the first guy who understood me well and also he had succeeded to fix his LS400's ECU. Then he decided to started the thread," All my crazy Lexus issues SOLVED!! (ECU-leaking capacitor)".
As a Japanese engineer myself and a guy who knows some behind scenes of the car, I recommend you to replace those capacitors for a preventive measure. If you are not good at the soldering work, ask him for a help. He does have good knowledges, skills and the experience. My intention is to keep our precious LS400/Celsior on the road longer. One of the most serious problems is the ECU capacitors issue and I suggest you to replace those before the board is damaged by the leaked liquid which is very strong alkali.