L.B.
Hi L. -
I have an LG front loader that just recently had a very similar problem, although mine was only 2 years old, and no longer under warranty.
I used Miles Appliance Service, the guy was awesome, had it working in 15 minutes (although it took almost a week to get the part from LG) and it cost about $350 for repair - which is ALOT cheaper than buying a new one! He actually told me over the phone what the problem was, and a coupe of other companies wanted to charge an extra $100 to come out and look.
Miles Appliance Service
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Good luck! L.:)