Howdy crelf,
Depending on the type of PXI-1000B chassis, a replacement shuttle may be available through the RMA process. I'd suggest calling NI support directly and setting up a service request at 1-866-275-6964 to check about this issue. I'd like to also point you to the KnowledgeBase article
What Type of Fuse Is In the DC Power Supply Cable of the PXI 1000B? if you'd like to do some additional troubleshooting. Have a great day!
Sincerely,
Chris G in AE