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Unfortunately, failure to comply with NLRB subpoenas is treated the same as a contempt of court, since they have been granted subpoena powers. You cannot be jailed initially for failure to comply, but you can be fined and also be ordered to pay the costs of getting a federal court order to comply (continued refusal to comply can result in jail for contempt of court).
If you cannot pay the money, you still need to supply what the board is ordering you to supply to them. If this award will cause you to not be able to pay your bills as they come due, you can file for bankruptcy as well and place the company in bankruptcy to seek relief from any judgment against you.
You need to produce everything they are asking for. If they ultimately issue a judgment against you and it will cause you to become insolvent, then you can consider filing for bankruptcy to get the judgment extinguished in bankruptcy.