This won't sooth much for you, but:
My slide does the 9 blink code always. It never stops.
The slide works fine. The last thing I wanted was some fixall warranty guy fiddling with it while it was working.
I can tell you, and it may be entirely unrelated, my 110v outlets used to short out on the slide. The slide had crushed a 110v connection box, maybe frying something in that 9 blink system.
Not an idea, not an excuse, this is just a thought for you to file away during your investigation.
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