Well, you have problems with Selespeed system, but it might not be Selespeed caused, looking at your other problems.
Selespeed will not cause bulbs to flash, or throw non-Selespeed errors on the dash.
Bad earth ? CANBUS problem ?
Have you checked your ECUs, are they seated properly ?
Try disconnecting the battery for a while, then connect it up again.
Also, Selespeed actuators very rarely fail. The rumor about failing Selespeeds and actuators comes from dealers who throw parts at a problem in order to fix something they do not understand.