in order to be of any real help your going to have to provide a serial number for this unit
there are too many serial number breaks in the manuals to determine what system this unit has just based on a model number.
but based on your description if your handset analyser does not power on when you switch to platform control mode then the problem is in the relays or wiring going from the power supply to the controller from the key switch power circuit.
Just make sure the estop on the remote box in the platform is turned on. There might be a possibility that the harness in the sissor assy is damaged too like was mentioned so check this harness very carefully paying attention to where it runs around bends on its path through the sissor assy.
Also check the connector where it plugs into the remote box on the platform.
using a wiring schematic will probably be helpful tracing this out.
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