I received a Lionel SP Mi Jack Intermodal Crane 6-12936 to repair. The lift assembly fails to go up or down. All other functions work.
I took the lift box apart and discovered the problem. Both gears on the shaft driven by the motor worm are split.
I would imagine this part is available as it is the weak link when lifting a container/trailer?
With the Lionel support web site down for the move I can't look up the part number or availability.