[TenTec] Corsair II noise blanker

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Of my two Corsair II's, one has a NB board p/n 80977, which correspond to the NB called out in the manual. The other Corsair II has a NB board p/n 81401, for which I've not been able to find any documentation. TenTec has been unable to find documentation for this NB, despite the fact that it appears to be of production quality (not one-off lab bench quality). Does anyone else have a Corsair II with the 81401 NB, or any information (schem and interface interconnect) for this NB? The 81401 NB has roughly 2/3 the component count of the 80977, and has no unpopulated holes or device hole patterns. S/N of the Corsair II with the "rogue" NB is 561-02258.

Thanks,
Allen---W7GIF