Long story short - I have an HTR-5590 and several keys on the remote do not work well anymore...a replacement costs $150 but my friend back east recently got a 5890 but has a universal remote and therefore has no need for the 5890 remote...can they work interchangeably or is there a way to make it work? I could try it but I don't want to have to have him mail it to me here and then it doesn't work and then mail it back...