Y1 is a crystal. I think (Someone re-check me on this value, please!) the value is rated at about 31.768 Khz. It may be similar to ones used on Mac SE, SE/30, IIx and other model Macs from that era. I'm not sure what value D1 is, since I don't have any Classic I logic boards for reference. It could be a 2N3904 or something different. Can you check the ID number on the flat side of that transistor, please?

73s de Phreakout. :rambo: