i know it's been a few days since this last post was first posted.
if you've lost platform controls i would check the key switch that switches it from ground control to platform control, make sure it is actually doing that. If it is then back probe the circuit through the harness up to the platform control plug and make sure it is supplying the signal at the platform control box. If it's not powering that box on the unit will not function. While doing that check the scissor harness and make sure there are no chaffed parts of that cable, there are several parts that bend when raising and lowering and when they age those sections do tend to break apart, covering comes off, wires break internally etc.