It's got to be in the self-leveling.
Here are pictures of this morning:
and
So she raised herself back up. It must be a bad valve somewhere - if it were the mounts, she'd just sit there.
126nut - Thanks for the compliment! They are great looking cars if kept up. That's why I put all that work into it.
Mike - the fluid level looks excellent. I checked that. Also no leaks around the pump or anything.
Does anyone know about the specifics of the regulator valve on the system? As I said, accumulators are fairly new.
Thanks to all for the other comments regarding the sunroof backup (that's obviously been identified now). I will send the picture of the hose to Phil at Fastlane and see what he sais - I think it is the evaporator drain, though I am very surprised it's partially made of foam!