Ours is BAS/ESP and spoiler up and is all tied into the water in trunk/central locking system... this is just another symptom as well as previously having alarm going off randomly, driver door not locking after pulling away and various other minor glitches... new central locking module and reseal boot spoiler and petrol filler are next jobs, will post if cures it

 

I don't recall any posts linking the BAS/ESP light to the central locking/SKREEM system. I think you have two issues and the only way to know why the BAS/ESP light is on is to have the car read by the DRBIII tool.