Just a quick update to say that following Hunted11’s advice, I cleaned the input selection switch with DeoxID, removed oxydation from the RCAs, and the phono inputs magically reappeared. They had probably not been used in decades, if ever. Same with the Tape pushbuttons, which I have managed to push all the way in until they clicked. Still harder that the other buttons though. I am keeping them pushed in for now, rotating between one and the other from time to time. Looks like this unit has not been used in a very long time. Tomorrow I will call Mcintosh, and see if they still have the glass in stock.