Please recall the DAC/TCG curve which you stored. Go to DAC/TCG option, select SETUP menu. You will find a DELETE CURVE showing as . If you want to delete DAC curve, push joystick Left or Right after that press Function1+Function2 buttons at a time.
I think you will get the result, which you are looking for.
Can you please confirm, is that the above procedure have you followed?
Ok yes, pressing the F1 and F2 button does delete the curve but when you realize the following.
DMS go the F1 and F2 buttons are both on the top toggles with F3 F4 on bottom.
USM go the F1 and F2 buttons are both on the bottom toggles with gain on top.
A three hour frustration trip depending on which mode you have become comfortable with first.
Don't think I will tell anyone else at the shop about this.. Why take all the fun out of it for them.