Additional/updated information was added to reflect the device being returned to the manufacturer for evaluation, and subsequent testing verified the complaint.The underlying cause could not be determined after reviewing the documentation in this investigation.Per the initial evaluation, the left front caster three-wheels and does not touch the surface of the ground.An expanded evaluation was performed.Per the expanded evaluation report, the left side of the wheelchair was slightly raised so that the left caster did not touch the ground, and the left side frame appeared to be slightly uneven.When the chair was pushed forward, it would lean slightly downward on the left side.
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