I have had this same problem on two different SAVP's now. Both required the same repair. The LED light board in one of your reels could be defective. Swap your reels to different positions. See if the error changes reel numbers, they are numbered 0 to 2. Common sense said it should be identified as reel one, two, and three. But IGT made it reel 0, one, and two. Replacing the LED board within the reel fixed the issues for me both times. Both of these machines had been playing fine, by the way, then one day they puke. Hope this takes you to the problem.