Product review (5 stars): Kenmore Elite Oasis HE
I was getting the UL error every wash, even on the gentle cycle. Read the reviews and decided to try replacing the part myself. Took about 20 minutes start to finish.  So glad I didn't pay someone to come out to do this! Did a load of towels right after and no more knocking! 45 dollars and a putty knife (to open the lid of the washer) will save you $$$
Model number 110. 27072600
Hint: use the hook end of the old rod to pull the new rod up into place. You can search YouTube to watch before hand. Very simple replacement.