Take your valves out (be careful not to get dirt into the pump) send them to this guy for a rebuild.
Machtech Direct
605 Furnace Rd.
Conneaut Ohio 44030
Phone: 440-499-5813
Email:
mark.machtech@gmail.com
Normally a 7 - 8 day turn around and about $75.00 he has done a bunch for our members.