The first thing we need to do is determine where the sound is coming from. Make sure you have the TNut/TBolt and thumb screws fully tight and try to determine where the sound is coming from. Most of the time the creaking comes from the aluminum rubbing with the plastic.
A quick and easy fix is to lubricate the joints where the aluminum tubes meet the plastic parts. There are 4 places we suggest lubricating: Foot to Foot Tube, Platform Tube to Knee Platform, and the two Upper Primary Tubes in the Knee Platform. Any light oil would work: 3-in-1, Tri-Flow, or even canola oil. If that doesn't work, we would suggest lubricating the hinge in the gray tension-lock buckles in the middle of each strap. Generally, the noise does not comprise the strength and safety of the device.
If you continue to experience the noise and would like further assistance please contact us. If you are able to provide a video of the noise this may help us identify the issue much faster.