Andra Hutton could be the motor as well as the electronics. Let’s see what it looks like I suggest you start by disassembling it using something like this guide [guide|104289]
Make sure that mechanically it all looks okay. You can always post some of your devices images, with your QUESTION, while you do the work. that way we can see what you see and possibly assist you further. Let us know if you find some oddities etc. [guide|21499]