M & S SYSTEMS N-65RS 5" Indoor Intercom Station with Remote Scan

hi now we have something completely different I was contacted by a customer a week ago or so he was interested in having some of his intercom equipment re whitened the only trick was it's not new tone its music and sound and it's not music and sound from the time when Nortec bought music and sound and then bought new tone and they were kind of merged together to some degree and and all that stuff this is music and sound before all of that so this is the real real music and sound he has near as I can tell because I didn't get a picture of it here either has an MC 602 or an MC 702 not sure exactly I think it's a 602 because it's a four wire system and this is one of the remote stations and he's got like six or eight of these in his house plus the master station and he said they're starting to yellow and his wife doesn't like it and would I rewrite them for him and I told well there's a ch