The orange light staying on is a sign that the suspension is outside of its normal limits - either too high (for example if the user had changed levels and the suspension was sometimes above its highest setting) or mores usually if the system falls below the minimum levels set up. You can try checking all of the level sensors / arms to make sure none have come off first and also note if any corner of the car looks low when left overnight. Next I would try re-calibrating the suspension with vagcom if you have it and failing all of that then you would normally be looking at the air suspension compressor needing to be either overhauled or replaced due to insufficient pressure being maintained (or not being able to pump enough pressure) and if the pump is testing fine then you would need to start looking for leaky air pipes in the system or for a leaking air bag or reservoir which is a bit more complicated
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Confidence is the feeling you have before you know better . . . . 
Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange
2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee
20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble 
Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior
Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble
Audi A8L D2 4.2 Petrol with LPG - Ebony Black
Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black
Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior
and some other A8's A8L's and Mercs
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