Thanks for your response to my private message earlier....somehow I've deleted it before reading it all 🤯
Not driven the car today so just gone out to it, on the bump stops, 20 seconds after starting it was up to standard profile. By morning it will be back to the bump stops.
Fortunately my reply is still in my Inbox, so a quick copy and paste:
If it is dropping when parked you may have a leak somewhere. Once the engine is turned off, 2 hours after it was switched off and then every 6 hours the EAS timer wakes up and it self levels. It does that by lowering the other 3 corners to match the height of the lowest. So if one corner has a leak it will drop, the timer will wake things up and lower the other 3 to the same height. Then the iffy one continues to drop so the other 3 are lowered again until it is sitting on the bumpstops. However, if the car is parked on an uneven surface so the suspension on one corner is compressed, it can see this as being low and lower the other corners.
The way to stop the self levelling is to pull the fuse that supplies the EAS ECU. This is fuse 44 on a GEMS car (up to 98) or fuse 29 on a later Thor car (99 onwards). Both these are in the underbonnet fusebox. Without the self levelling, if you have a leak on one corner, that corner will have dropped while the other 3 will stay up.