Hello scientificimaging:
For the NI-6111 and due to the reason that you want to build a test bench. One solution could be to get the internal connections diagram from NI MAX and run different task capable of getting expected behavior according to the specifications and manual for this specific Hardware. This for the test part and for the repair question is better is you get in touch with the distributor of the product.
I hope these suggestions work for your case and have a nice weekend.
