> 1. For the missing sawtooth wave I´ve checked the G2 wire - it´s ok
When you say that it's OK, do you mean that you can measure some voltage at G2 when the SAW switch is on and nothing when it's off, or is it only based on a visual check?
There's also the transistor TR6 that you might check before discarding IC9.
> 2. For the missing G note aftertouch I´ve checked all the wires on the AT boards and they seem ok. Is it possible that the sensor´s broken or dirty?
I don't know if those sensors can be broken (has anyone ever seen one broken?): I cleaned mine recently ; a few were a bit dirty but none had sign of wear. With a swap, you should be able to determine if there is a problem with the sensor.
Joachim