I have 4 different TCU ROM dumps that you can download for free if they are any use to you. JDM 92 & 94, UK 92, USA 92.
http://www.alcyone.org.uk/ssm/roms/index.html
I also have a modified version of the UK one but I don't know how to install it into the TCU. 
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Subaru ECU and TCU Website
1992 Alcyone SVX Version L
1992 Alcyone SVX Version L
1994 Alcyone SVX S40-II
2004 Subaru Legacy 2.5 SE Sports Tourer
1996 Subaru Legacy 2.2 GX Wagon
1988 Subaru Justy J12 SL-II
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