Ports being damaged on PxI-6508 DIO

wondering if anybody else has run into this or something similar. I'm using two PXI-6508 DIO cards, one in slot 2 of my chassis and one in slot 3(PXI-1010 chassis). the card in slot 3 is for digital outputs, slot 2 is for digital inputs.
A few months back I had to have the card being used in slot 3 repaired because some of the ports had been damaged (pins were stuck high). After the board was returned I installed it in slot 2, now the other board that is in slot 3 has damaged ports(not the board that was repaired before).
The confusing thing is that the board that I'm testing with them is just an interface board, it's basically all straight feedthroughs some with pullups or some lines are inputs to an inverter or something similar
. Nothing high current/ voltage. The pins that got damaged actually just drive lines with only a pullup and no other electronics, so I'm basically coming from slot 3, through a 1K resistor in my fixture, into the B.U.T. and then into slot 2.
I was told it could be a grounding problem and to make sure the grounds from slot 3 and 2 are at the same potential...they are. One interesting thing though. The cable coming from slot 3 was damaged and one of the grounds from the card was not getting to my fixture...but the other one was...and the grounds are connected internally on the PXI-6508 so as long as one is connected to my system ground then I should be ok right?
Anyway, has anybody else had problems with DIO cards? Like I said I'm not working with high currents or voltages...only ports being used as outputs have been damaged.
Any advice?
Thanks in advance

Thanks for the reply Spencer, yes it turns out the same lines were damaged in both instances. Actually the ports CPBA, CPBB, CBPC were damaged both times.
I found a problem in my fixture where I had two digital lines coming from the DIO cards (both outputs) going to the same pin on my board (via two different connectors) I was driving one of them high and low while the other one was initialized low but not used. This could have been my problem, essentially what I had done was connect two outputs together, both initialized low, and then driven one high. I've made the necessary changes in my fixture and HOPEFULLY, this problem will not occur again.
Thanks

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