I have tried to repair the unit because it drains very slowly. I replaced the drain pump and put on a new discharge hose to the disposer. I could not find any kinks or clogs in the lines. Hose is elevated. I read somewhere that there might be a problem with a check valve. The only thing that I have seen on this unit was where the drain hose connects to the pump, it is a 90 degree rubber fitting, and it is stamped "do not remove check valve inside". I saw some videos showing that a check valve was under the cover of the lower wash arm, this unit does not have that kind of access. Any ideas would help, this unit also has some kind of sensor in the hole that the filter goes into.:(