Hi,
please have a look here:
http://files.hddguru.com/download/Non-P ... 20Digital/ .
I stored a file WD400BB-00CAA0.<serial>.zip Firmw. 16.06V16 there.
Have fun, and good luck!
(modules and ROM-data are also working with PC-3000 - just rename - , but both channels were in use, so I used SD for extracting..

)
By the way - are you shure, that you really need a ROM file?
Thomas