Engine warning light on

Car was brought in to the dealer yesterday as the Engine warning lit up. The engine light first came on 3 days ago, then cleared the next day. It came back again the following day. LR Service connected their computer to the ECM but found no error code at all. This is the first time they have seen this according to them.

They decided to upgrade the Car software version ( i was running on Version 3316_111019) to a newer one. Anybody had the same experience?