Product review (5 stars): I fixed my own washer!
When my LG front loader stared to make a slight growling noise with no spinning during the times it should spin (and eventually stopped with an LE error code), I turned to the internet and quickly found out it was likely a bad rotor position sensor.  I ordered a replacement and using a video I googled (can't post the link, but was put on YouTube by Repair Clinic) was able to replace it myself.  The part arrived in about 4 days.  And now I am washing a load of towels with the pleasant noise of a properly spinning washing machine behind me.  Only took me about half an hour to do the replacement.
(A small tip - when you are replacing the tub bolt, it will never tighten all the way because when it is tight enough it just spins the tub.  Took me a minute to figure this out as I kept spinning the socket wrench and it never seemed to get tight.  You will need a phillips head screw driver and a socket wrench with 17mm and 10mm sockets for the job.)