I was dinking around with some spare Tivo remotes and found one that apparently doesn't like to put out the correct code for one of my TVs. It does put out the proper code for another TV so I know it sort of works. It's not a problem with the number keys and I've verified that the red light on the remote blinks with each key press. What does appear to be different is that the "good" code will cause the red light to slowly blink several times after the last number is entered but the "bad" code causes the red light to just go out. Anybody ever seen this type of behavior?