ABS / Suspension ECU

Hi All, I'm a new member & 1st post so please bare with me. I have owned a 2004 l322 for past 3 yrs or so. I think I need a new/replacement 'ECU'. Problem is that suspension won't go up or down & have ABS & other warning lights continually light on dashboard, also have ,'air suspension inactive & hdc inactive' message. Been quoted £1,600 for new ECU & was wondering if anyone knows if I can get a used one anywhere.
Also been told that the support brackets on my aftermarket side steps are corroded & need replacement, are replacement brackets available anywhere?

Welcome, and well done for putting location and vehicle type in 1st post.

You need to get proper diagnostics. Unlikely to be the ECU. Either find somebody on here, or garage with "All Comms", "iCarsoft i930", or better still "Faultmate". Land Rover will simply charge over the top.

Have you have flat battery ? can cause the above faults.

LR side steps always seem to corrode on all LR cars. Check eBay for spares or replacement.

As above, ECU very unlikely, there are all sorts of issues unrelated to the EAS that can cause it to lock out, nothing more to add other than without diagnostics you are in for a very expensive ride, if you are keeping the car, get an allcomms is my advice, it could be something as simple as a faulty abs or height sensor or even that it has been jacked up and has picked up some crud on the height sensor and now needs resetting .

Check the air compressor pump in the wheel well in the boot ,but you need the fault cleared if its not running or pumping air.