Yep i would say if your speed relays are up then it is most likely in the GLF resistor section(where the step relays short out the resistor) and there is a open circuit under load on a wire or contact. This also applies to the GSEF also. The current must going thru the resistor systems, so to prove which area is to place a short across each section 1 at a time and see if the lift speeds up.