I replaced a check valve a year ago because a serviceman told me it was not working. They also took off the water jet covers and said that I had s leak at the skimmer. It was fixed. About 3 months later , the spa started to do the same thing. Could the check valve be the problem again? I paid over $250 to deal with it already. Is the set up proper , or should I reposition the check valve Is it in a proper position being at that height.