daughters 04 vert is testing me. switch and electrical work well. pistons replaced and worked 2 months. motor opened up and all works well, installed another used pump and the same drill. it spins and pumps and the pistons have a gurgling sound. ran it up and down manually while full of fluid to see if it was just trapped air. no relief. 15 year old son installed the new pistons, they had a few leaks which we fixed. no leaks to be found, full reservoir. Don't know where to go from here. please help if you can.