I'm working on an old SB303. A couple of issues. While I was checking the resistors on the BFO and Audio boards I noticed at least one or 2 resistors that were not matching what the schematic called for. Does anyone know of any factory changes for this rig? Or know were I might find this info. Also in doing the tests on the BFO board the all check out good (all be it VERY high) except the +10 volt. The Diode and resister in question were fine. Were would I test the +10 and +30 volt lines?