Washer out of balance errors

HELP! My front load washer will not execute the spin cycle. It has out of balance errors at low RPM. Unbalanced curcuit errors also. I had a service call. He replaced a foam stabilizer underneath that had worked its way loose.All other diagnostics appeared okay.Tested empty okay.When i tried a load, no luck.Called him back in.He replaced the Inertial Balance Switch with a used one, and eventually bypassed it. Still no luck. Won’t spin a load unless it is light and perfectly balanced. He recommends a new wiring harness for balance switches but says the part is no longer available. He says mechanically everything seems okay. He says I need a new machine.Machine is great but for this problem. Any advice?