I would have at least tried to replace the diodes down his left side. Though I imagine the conversation would have gone something like this:

"Marvin, do you want me to replace those painful diodes down your left side?"

"Now they ask me if they want my diodes replaced. Of course I want my diodes replaced; they hurt a lot. Here I am, brain the size of a planet and they ask me stupid questions like that. Maybe I should cast my head in concrete."

"I would like to help you not be in pain anymore. Can you show me your schematics so I can order the parts?"

"of COURSE I can. It would be the very simplest task. Oh god, what next?"

"You know what? Never mind."

"Life. Don't talk to me about life."