need experts helo on robotic transmission clutch

[mariann]

i have reachd 125000Km with my 2007 yaris.
it have robotic transmission.
i think the cluch is starting to slip under hard load.
first of all it acting wierd and its not slipping al the time. and when it slips sometime a moment later its chatching back the flywheel by itsalf... i think the cluch getting loose.
anyway... tomorow morning i'll change my clutch for 950$ at the dealership.
outside the dealership replacement clutch and work will not reach more then 350$.... but as far as i know they cant reset the robotic transmission without the toyota computer...
is there any way you know guys to reset the gear without connecting the service computer?
is it the time to change clutch for robotic transmission or its a computer problem?
with normal maual transmission its easey to check if the clutch is slipping, but i dont know how to check with robotic transmission exept of loading the engine on the third gear and stick accelerator till the end and watch if the RPM rising without pulling the weels accordinly.

thanks.