We were initially running the old H2 IO Chassis for the H1 PSL. However we found two ADC channels had large DC offsets (in the first and third ADCs) and the duotone had bleed-through into the adjacent channel. We re-ordered and re-seated the cards, but the problem did not change. We then installed the H1 PSL Chassis and the problem was resolved. We will run the old H2 IO Chassis on a test system to determine if the problem was caused by bad ADC cards.