My 50 Gal. Hot water tank is 4 years old. It started making a gurgling sound when water is used in the house. It doesn't matter if it is hot or cold being used. The dip tube was not broken. I drained it to change the tube, and no sediment seemed to come out of the tank. All of this seems to have happened around the same trime that the thermalcouple went bad. Most of the discussions have been about older tanks, any suggestions.