A6 Allroad C7 air suspension issues

[Dave May]

I wondered if prior to ordering a compressor repair kit if anyone could advise on an issue I am experiencing with my 2013 Audi A6 Allroad C7 and if in your opinion a compressor kit would sort the issue.
At start up and moving off the suspension appears to function properly but after a couple of minutes a warning message appears showing  “air suspension fault” and the ride/ suspension seems to feel less compliant and firmer, the ride height appears to be OK and when the car is turned off the car maintains its height when parked, on start up again the fault doesn’t show again until the car is driven for another couple of minutes.
We have scanned the system for fault codes with VCDS and three codes are stored 
455693 front right ride height sensor mechanical failure.  403200 function shut-off active.   453633 pressure sensor for level control, residual pressure for lowering rear axle too low. I have forwarded you the screen photos of the VCDS scan below.
Please could you come back to me with your thoughts/ advice.
Thanks in advance