We have just published Sansui TU-717/517 mods on Jim and Bob's DIY page here...
http://www.fmtunerinfo.com/DIY.html#TU-717 I've made at least a couple of errors and Eric is working on them. Hope these are of some help to fellow DIY'ers. If anyone finds errors or wants to contribute more, please email me. 8:-) jim...