Does it sound like the motors are loud? or do you notice a grinding sound...motor gears on the track? Or is the trouble the motors just don't turn?
With he slide extended a bit follow the bottom track in to where it meets the coach. There is a small flat shelf behind the rubber seal. Easier seem from under the slide...check that small shelf for metal shavings. There is actually a bearing block there with a plastic wheel on the bottom that the track glides on. Metal shavings there will indicate grinding of the gears (that mesh with the track) on the hex rod that the motor is turning.
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USN - RETIRED NUKE
Taunton, MA
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