Newbie - Please help....another height sensor issue

I have an 09 sport, auto 2.7 diesel V6.

This originally started off as a handbrake issue along with the red light of doom, the height problems.
I ignored it as the car drove well and never went into limp mode at all. Until time for the MOT cam round again. I haven't replaced any parts.
I have worked through attempting to diagnose what the issue is and although I have all working sensors, the pump is working well and not overheating, and I haven't found any issue with any of the associated ecu's, the diagnostic system shows no faults except some stored ones not relevant to the suspension system the red light flashes then stays on permanently.
I have completed the calibration correctly and had a successful message. I made sure the system is in normal mode and not in freeze or manufacture mode and the red lights still on.

The only thing I noticed was after resetting the system prior to the calibration, there were 3 statements,
1 was normal mode
2nd said something about dynamic stability
3rd said all ok

I'm thinking the issue is around the dynamic stability.
Is there any way of knowing if this is affecting the red light problem? Or a test I can do to see if there is something that's failed?

Any ideas gratefully received as have already cancelled the MOT twice. Hoping to get it finally back on the road for the new year.

Cheers

Electronic Air Suspension and Active Roll Control are two separate systems, it reads to me as you have an ARC problem, not EAS.
Please list the DTC's you have, they may be relevant to ARC.

Thanks. I will take pictures of the dtcs tomorrow and respond here in the evening all being well.

Do you need any other info that I could get??

ARC fluid level check and visual check of valve block (drivers side, approximately in line with 'B' pillar) & lines for leaks or damage would be a good first line diagnostic check list.