Come to think of it, a line I wouldn't mind seeing cut from ESB:R is one of these lines. "The city's central computer told you?" is purely repetition-for-the-audience, as seen if we translate R2's lines based on 3PO's replies:

C-3PO: "How would you know the hyperdrive is deactivated?"
R2-D2: [The city's central computer told me.]
C-3PO: "The city's central computer told you?"
R2-D2: [That's what I just said, stupid.]
C-3PO: "R2-D2, you know better than to trust a strange computer!"

3PO comes across as obtuse and slow; omitting the second line rectifies this. The third line gives us all the information we need to know from the second line, particularly given we saw R2 interfacing with the Cloud City computer and he mentioned the Falcon's hyperdrive (translated by 3PO in a non-repetitive way) then.

It would also work fairly well, I think, if you cut it this way:

C-3P0: "How would you know the hyperdrive is deactivated?"

R2-D2: [The city's central computer told me.]

C-3P0: "The city's central computer?! R2-D2, you know better than to trust a strange comuter!"