HWH Jacks will not retract

[GregOConnor]

If issue returns, clean the connections of the wires at the valve manifolds (I had a gremlin that cleared up with that assumed fix). also one of the pair/front and one of the pair/rear are grounded at the pump ground bus. so if it was loss of voltage at the jack that truly caused the issue, the ground is always 50% of voltage. the pump area is a dirty place and dirt causes some issues if that pump and area is clean clean clean like I suspect it was, your PO (previous owner) was pressure washer freak ( a good thing if you like clean) so look for water dried up in connections and rust under grounds.
http://www.hwhcorp.com/mp88101.pdf