ABS & Rear brake issue- Post front caliper rebuild

[RossKean]

Perhaps the problem is inside the unit due to a stucked solenoid valve.
Here is the procedure to disassemble the valves for Gen1 unit.Probably it is the same procedure and for the Gen2.

I have never seen a successful repair of an FJR ABS unit! Don't speak the language, but you can get English subtitles. (Bookmarked for future reference)
A stuck ABS spool almost always results in (usually rear) failed ABS but brakes still work. I believe that the 2004-05 Gen ABS unit is essentially the same as the 2006-07 but with the linked right front lower piston pair in the Gen II.