I have the same problem and posted here looking for a solution.
Since, I came across a company called "e spares" They have an excellent video on how to replace the turn table motor. Worth a look.
touchstone
February 2016
Automatic Answer
While you wait for answers, we may have found some information which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix microwaves.