I didn't read this whole thread, but just sharing my problem.
I bought a shaker motor from Stern and installed it on my Iron Maiden. It wouldn't work. Diagnosis? Cabinet node board is faulty. Out of warranty and not even 5 months old. How was I supposed to know the board was faulty until I installed the shaker motor? I won't say I'll never buy another Stern, but I'm taking it into serious consideration in the future that they don't support their products.