Some progress.
I nipped up the pins at the modulator connector and it seems to have fixed the right rear output solenoid error.
However, the shuttle valve error made a brief appearance early on yesterday's drive, but all good for the rest of the day. So I seem to be getting somewhere.
At least the shuttle valve error, if real, can be easily fixed.
I think I'll leave things for a few weeks and see how it goes.
Anyway I found a new problem yesterday. The back passenger door won't open from inside. Does it never end?

