Someone gave me a twenty-year old Sharp Carousel in cosmetically
perfect condition. The inside even smells new. The AC stuff and bells
and whistles are working. The turntable coupler (very tiny plastic
square plug that sits exactly center and connects the glass turntable
and turntable spindle to the underbelly...allowing the glass to
rotate) is broken. A replacement sells online for $10 shipped. I
searched to see if microwaves are worth repairing but couldn't find
anything, so I thought I'd post here.

Would a broken $10 coupler indicate problems with the microwave that
can't be seen? Thanks.