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NAD 517 CDP Service Manual Needed

I am in need of a copy of the NAD 517 CD player service manual. Some CDs aren't even recognized. And others that do start to play sometimes will just stop playing in the middle of a track. From posted information about other NAD CD players, it could be a belt or a bearing that needs to be replaced. I just need to figure it out. Any help would be appreciated. Merry Christmas! Happy Hannukah! A Wonderful Kwanzaa!