range rover p38 1995 air surspension advice needed

hi all about 2 weeks ago while going down motorway for some unknown reason I felt I had lost lift ( never had a problem before) vehicle was recovered to local garage they have don't a diagnostics and data test they found faults on ecu and air suspension module faulty the module has been replaced the ecu been replaced all errors have cleared data test is saying car is functioning good but car will still not lift is there somethink that I havn`t done ie reset the air compressor is ok please if any one has any idea please advise
many thanks
karl

What do you mean "lost lift"? What do you mean "Don't a diagnostics"?
What diagnostic tools did they use?
Do you mean the vehicle dropped to the bump stops and put up the "Max 35MPH" message on the console?
Get a better garage, your's don't seem to know what they are doing. They seem to like swapping parts without understanding how it works.
If its sitting on its ar$e, there is a leak or the pump has gone.

my vehicle now is sitting on the wheels no message has come up on dashboard when you say the pump is that the compressor under bonnet there saying there are no leaks as for the diagnostic all I know is they called out someone to do a indepth one the data test is coming up with no problems just cant get caar to lift

Hello and welcome
Best to post over in the range rover section of the forum and the guru`s will help you

https://www.landyzone.co.uk/forum/range-rover.10/

Welcome to the forum