The usaul story, you get a service, and wierd gremlins come out of the closet.
I had a small leak from the Transmission cooler line, had it tightened up, and the mechanic sprayed some sort of Alchohol mix onto the lines, from the top and bottom of the car. Four days later, when I go to fire up the car, the "Check Engine" light starts blinking like crazy. Shut the engine off, start up again, and the light goes off.
Try the ON-OFF trick, and no codes, fortunatley I know a Friend that has the reader, plug it in, and just the "55 End of Trouble Codes". Start the car today, the Check engine starts blinking like crazy again. Has the twit hit something he wasn't supposed to, the only thing inside the bay near the transmission lines is the horn, and maybe the alternator, but that should throw up a warning of its own ?
Has anyone had this happen?