When the machine is running and the drain pump is engaged, the drain pump is making a noise. It also does this when I manually press the drain pump to lower the water level. I’ve already ran several tank cleaning and purged the low pressure lines to ensure nothing is clogged and everything is working fine. The drain filters have also been cleaned and purged and are clear. The abrasive collection water is also running well with no issues. Does anyone have any other ideas on how to resolve this issue or could it just be the pump itself??