[Premium-Rx] RA6790 with VLF option

[Choe]

Does anyone have any technical information or source on RACAL R-2174B(P)/URR ?
Recently I obtained a RACAL RA6790/GM with VLF option (R-2174B(P)/URR) from a local HAM. I have manuals of RA6790/GM(R-2174(P)/URR, and they cover circuit card/module  A1 through A10 only, but this receiver has additional circuit cards/modules A14,A15, A23, A24 and A25. 
Any information will be welcomed.

My e-mail address is hankukp at kg21.net.

Choe
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