Phoinix,
Can't remember when the discrepancy warning will pop up. If it does and upsets things like the autopilot just switch to I or II ADC.
If you physically swap ADC's is probably an easy way to troubleshoot things if you don't have pitot/static test gear close by. If the fault doesn't follow the ADC you have a leaky pitot, not as uncommon as you think on a 135!
